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Golden retriever Lilly, a retired search and rescue dog from Wichita, Kansas, looks after her own pup and three African Wild Dog pups at the Oklahoma City Zoo in Oklahoma City, Tuesday, Nov. 11, 2014. The pups birth mother was unable to care for them. The red mark on the female pup is for identification purposes. (AP PhotoSue Ogrocki)
Golden retriever Lilly, a retired search and rescue dog from Wichita, Kansas, looks after her own pup and three African Wild Dog pups at the Oklahoma City Zoo in Oklahoma City, Tuesday, Nov. 11, 2014. The pups' birth mother was unable to care for them. The red mark on the female pup is for identification purposes. (AP Photo/Sue Ogrocki)
Golden retriever Lilly, a retired search and rescue dog from Wichita, Kan., looks after her own pup and three African Wild Dog pups at the Oklahoma City Zoo in Oklahoma City, Tuesday, Nov. 11, 2014. The pups birth mother was unable to care for them. (AP PhotoSue Ogrocki)
Golden retriever Lilly, a retired search and rescue dog from Wichita, Kan., looks after her own pup and three African Wild Dog pups at the Oklahoma City Zoo in Oklahoma City, Tuesday, Nov. 11, 2014. The pups' birth mother was unable to care for them. (AP Photo/Sue Ogrocki)
Golden retriever Lilly, a retired search and rescue dog from Wichita, Kan., looks after her own pup and three African Wild Dog pups at the Oklahoma City Zoo in Oklahoma City, Tuesday, Nov. 11, 2014. The pups birth mother was unable to care for them. (AP PhotoSue Ogrocki)
Golden retriever Lilly, a retired search and rescue dog from Wichita, Kan., looks after her own pup and three African Wild Dog pups at the Oklahoma City Zoo in Oklahoma City, Tuesday, Nov. 11, 2014. The pups' birth mother was unable to care for them. (AP Photo/Sue Ogrocki)
In this photo provided by San Diego Zoo Global, four almost 4-month-old cheetah cubs rest alongside their mother at the San Diego Zoo Safari Park Tuesday, Nov. 4, 2014 in Escondido, Calif. The cubs, two males and two females, were born to first-time mother Addison on July 13 at the Safari Parks off-site cheetah breeding center. The family was moved to their new habitat at the Safari Parks Okavango Outpost this week. Keepers describe Addison as an excellent mom, calm, confident and extremely protective. They describe the cubs as very vocal, curious and playful, each with their own distinct temperament. Cheetahs are found in Africa and a small portion of Iran. They are classified as vulnerable on the International Union for Conservation of Natures (IUCN) Red List. It is estimated that the worldwide population of cheetahs has been reduced from 100,000 in 1900 to just 10,000 today, with about ten percent living in zoos or wildlife parks. (AP PhotoSan Diego Zoo Global)
In this photo provided by San Diego Zoo Global, four almost 4-month-old cheetah cubs rest alongside their mother at the San Diego Zoo Safari Park Tuesday, Nov. 4, 2014 in Escondido, Calif. The cubs, two males and two females, were born to first-time mother Addison on July 13 at the Safari Park's off-site cheetah breeding center. The family was moved to their new habitat at the Safari Park's Okavango Outpost this week. Keepers describe Addison as an excellent mom, calm, confident and extremely protective. They describe the cubs as very vocal, curious and playful, each with their own distinct temperament. Cheetahs are found in Africa and a small portion of Iran. They are classified as vulnerable on the International Union for Conservation of Nature's (IUCN) Red List. It is estimated that the worldwide population of cheetahs has been reduced from 100,000 in 1900 to just 10,000 today, with about ten percent living in zoos or wildlife parks. (AP Photo/San Diego Zoo Global)
This photo provided by the San Diego Zoo Safari Park shows four-month old African lion cub Ernest plays with a pumpkin at the San Diego Zoo Safari Park in San Diego, Calif. on Wednesday, Oct. 29, 2014. Staff at the zoo set out pumpkins for the lion pride as a special Halloween treat. (AP PhotoSan Diego Zoo, Tammy Spratt)
This photo provided by the San Diego Zoo Safari Park shows four-month old African lion cub Ernest plays with a pumpkin at the San Diego Zoo Safari Park in San Diego, Calif. on Wednesday, Oct. 29, 2014. Staff at the zoo set out pumpkins for the lion pride as a special Halloween treat. (AP Photo/San Diego Zoo, Tammy Spratt)
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Three week old white lion cubs seat at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion were recently born at the Belgrade Zoo. (AP PhotoDarko Vojinovic)
Three week old white lion cubs seat at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion were recently born at the Belgrade Zoo. (AP Photo/Darko Vojinovic)
Zookeeper Nadezda Radovic feeds three week old white lion cubs with a babys bottle at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion, were recently born at the Belgrade Zoo. (AP PhotoDarko Vojinovic)
Zookeeper Nadezda Radovic feeds three week old white lion cubs with a baby's bottle at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion, were recently born at the Belgrade Zoo. (AP Photo/Darko Vojinovic)
Zookeeper Nadezda Radovic feeds three week old white lion cubs with a babys bottle at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion, were recently born at the Belgrade Zoo. (AP PhotoDarko Vojinovic)
Zookeeper Nadezda Radovic feeds three week old white lion cubs with a baby's bottle at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion, were recently born at the Belgrade Zoo. (AP Photo/Darko Vojinovic)
Zookeeper Nadezda Radovic kisses a three week old white lion cub at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion were recently born at the Belgrade Zoo. (AP PhotoDarko Vojinovic)
Zookeeper Nadezda Radovic kisses a three week old white lion cub at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion were recently born at the Belgrade Zoo. (AP Photo/Darko Vojinovic)
A white lion sleeps at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. Two white lions cubs, an extremely rare subspecies of the African lion were recently born at the Belgrade Zoo. (AP PhotoDarko Vojinovic)
A white lion sleeps at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. Two white lions cubs, an extremely rare subspecies of the African lion were recently born at the Belgrade Zoo. (AP Photo/Darko Vojinovic)
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Zookeeper Nadezda Radovic feeds three week old white lion cubs with a babys bottle at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion, were recently born at the Belgrade Zoo. (AP PhotoDarko Vojinovic)
Zookeeper Nadezda Radovic feeds three week old white lion cubs with a baby's bottle at Belgrade Zoo, Serbia, Friday, Oct. 17, 2014. The two white lions cubs, an extremely rare subspecies of the African lion, were recently born at the Belgrade Zoo. (AP Photo/Darko Vojinovic)
In this photo provided by the San Diego Zoo, an African spotted-necked otter named Mugo examines a floating pumpkin in her exhibit this morning at the San Diego Zoo on Wednesday, Oct. 8, 2014, in San Diego. Keepers had placed pumpkins smeared with peanut butter and hollowed-out gourds with fish inside in the otters exhibit in Ituri Forest. (AP PhotoSan Diego Zoo, Ken Bohn)
In this photo provided by the San Diego Zoo, an African spotted-necked otter named Mugo examines a floating pumpkin in her exhibit this morning at the San Diego Zoo on Wednesday, Oct. 8, 2014, in San Diego. Keepers had placed pumpkins smeared with peanut butter and hollowed-out gourds with fish inside in the otter's exhibit in Ituri Forest. (AP Photo/San Diego Zoo, Ken Bohn)
A lion lays inside a metal cage at Al-Bisan zoo, as a medical team prepares to transfer three big cats to Israel en route to a better life at a wildlife sanctuary in Jordan after their zoo was damaged in the recent Israel-Hamas war, in Beit Lahiya in the northern Gaza Strip, Tuesday, Sept. 30, 2014. Three lions, a pair of males and a pregnant female, were sedated before the big cats were placed in metal cages and loaded onto a truck that transferred them through the Erez border crossing into Israel. Amir Khalil of the Four Paws International welfare group said the zoos animals were in urgent need of care after the 50-day war. He said the zoo was badly damaged and more than 80 animals died as a result of the fighting. (AP PhotoKhalil Hamra)
A lion lays inside a metal cage at Al-Bisan zoo, as a medical team prepares to transfer three big cats to Israel en route to a better life at a wildlife sanctuary in Jordan after their zoo was damaged in the recent Israel-Hamas war, in Beit Lahiya in the northern Gaza Strip, Tuesday, Sept. 30, 2014. Three lions, a pair of males and a pregnant female, were sedated before the big cats were placed in metal cages and loaded onto a truck that transferred them through the Erez border crossing into Israel. Amir Khalil of the Four Paws International welfare group said the zoo's animals were in urgent need of care after the 50-day war. He said the zoo was badly damaged and more than 80 animals died as a result of the fighting. (AP Photo/Khalil Hamra)
In this Sept. 22, 2014 photo provided by the Wildlife Conservation Society, grizzly bear Veronica is shown at the Bronx Zoo in New York. Veronica, along with grizzly bear Betty, will be relocating to the Central Park Zoo in November. (AP PhotoWildlife Conservation Society, Julie Larsen Maher)
In this Sept. 22, 2014 photo provided by the Wildlife Conservation Society, grizzly bear Veronica is shown at the Bronx Zoo in New York. Veronica, along with grizzly bear Betty, will be relocating to the Central Park Zoo in November. (AP Photo/Wildlife Conservation Society, Julie Larsen Maher)
In this Sept. 21, 2014 photo provided by the Oklahoma City Zoo, Kamina, a Western Lowland gorilla who was born Aug. 16 at the zoo, is pictured at the zoo in Oklahoma City. Kamina was rejected by her mother and has been moved to the Cincinnati Zoo. (AP PhotoOklahoma City Zoo, Jennifer DAgostino)
In this Sept. 21, 2014 photo provided by the Oklahoma City Zoo, Kamina, a Western Lowland gorilla who was born Aug. 16 at the zoo, is pictured at the zoo in Oklahoma City. Kamina was rejected by her mother and has been moved to the Cincinnati Zoo. (AP Photo/Oklahoma City Zoo, Jennifer D'Agostino)
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In this Sept. 22, 2014 photo provided by the Cincinnati Zoo, Kamina, a baby Western Lowland gorilla, arrives in Cincinnati by private plane. The zoo has adopted Kamina, born Aug. 16, 2014, from the Oklahoma City Zoo, after her mother shunned her and the Oklahoma zoo did not have an adult female able to adopt and raise her. (AP PhotoCincinnati Zoo, Michelle Curley)
In this Sept. 22, 2014 photo provided by the Cincinnati Zoo, Kamina, a baby Western Lowland gorilla, arrives in Cincinnati by private plane. The zoo has adopted Kamina, born Aug. 16, 2014, from the Oklahoma City Zoo, after her mother shunned her and the Oklahoma zoo did not have an adult female able to adopt and raise her. (AP Photo/Cincinnati Zoo, Michelle Curley)
In this Sept. 23, 21014 photo provided by the Cincinnati Zoo, Dr. Srikant Iyer, from Cincinnati Childrens Hospital, examines Kamina, a baby Lowland gorilla, in Cincinnati. The Cincinnati Zoo adopted Kamina, born Aug. 16, 2014, from the Oklahoma City Zoo, after her mother shunned her and the Oklahoma zoo had no adult female gorilla to adopt and raise her. (AP PhotoCincinnati Zoo, Michelle Curley)
In this Sept. 23, 21014 photo provided by the Cincinnati Zoo, Dr. Srikant Iyer, from Cincinnati Children's Hospital, examines Kamina, a baby Lowland gorilla, in Cincinnati. The Cincinnati Zoo adopted Kamina, born Aug. 16, 2014, from the Oklahoma City Zoo, after her mother shunned her and the Oklahoma zoo had no adult female gorilla to adopt and raise her. (AP Photo/Cincinnati Zoo, Michelle Curley)
In this photo provided by the San Diego Zoo Safari Park, two female cheetah cubs rest after a bottle feeding at the San Diego Zoo Safari Parks Animal Care Center in Escondido, Calif., Friday, Sept. 19, 2014. The cubs are being hand raised by animal care and receive round-the-clock care, which includes bottle feedings every few hours. The cubs were born Sept. 1 to their mother, Allie, who was unsuccessful in raising her previous litter. (AP PhotoSan Diego Zoo Safari Park, Ken Bohn)
In this photo provided by the San Diego Zoo Safari Park, two female cheetah cubs rest after a bottle feeding at the San Diego Zoo Safari Park's Animal Care Center in Escondido, Calif., Friday, Sept. 19, 2014. The cubs are being hand raised by animal care and receive round-the-clock care, which includes bottle feedings every few hours. The cubs were born Sept. 1 to their mother, Allie, who was unsuccessful in raising her previous litter. (AP Photo/San Diego Zoo Safari Park, Ken Bohn)
Young Malayan tapir (Tapirus indicus), right, stands besides his mother Laila in Gondwanaland in the zoo in Leipzig, Germany, Friday, Sept. 19, 2014. The tapir was born on Sept. 10, 2014. The Malayan tapir, also called the Asian tapir, is the largest of the four species of tapirs and the only one native to Asia. (AP PhotoJens Meyer)
Young Malayan tapir (Tapirus indicus), right, stands besides his mother Laila in 'Gondwanaland' in the zoo in Leipzig, Germany, Friday, Sept. 19, 2014. The tapir was born on Sept. 10, 2014. The Malayan tapir, also called the Asian tapir, is the largest of the four species of tapirs and the only one native to Asia. (AP Photo/Jens Meyer)
Young Malayan tapir (Tapirus indicus) swims in the water in Gondwanaland in the zoo in Leipzig, Germany, Friday, Sept. 19, 2014. The tapir was born on Sept. 10, 2014. The Malayan tapir, also called the Asian tapir, is the largest of the four species of tapirs and the only one native to Asia. (AP PhotoJens Meyer)
Young Malayan tapir (Tapirus indicus) swims in the water in 'Gondwanaland' in the zoo in Leipzig, Germany, Friday, Sept. 19, 2014. The tapir was born on Sept. 10, 2014. The Malayan tapir, also called the Asian tapir, is the largest of the four species of tapirs and the only one native to Asia. (AP Photo/Jens Meyer)
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Young Malayan tapir (Tapirus indicus) walks in the water in Gondwanaland in the zoo in Leipzig, Germany, Friday, Sept. 19, 2014. The tapir was born on Sept. 10, 2014. The Malayan tapir, also called the Asian tapir, is the largest of the four species of tapirs and the only one native to Asia. (AP PhotoJens Meyer)
Young Malayan tapir (Tapirus indicus) walks in the water in 'Gondwanaland' in the zoo in Leipzig, Germany, Friday, Sept. 19, 2014. The tapir was born on Sept. 10, 2014. The Malayan tapir, also called the Asian tapir, is the largest of the four species of tapirs and the only one native to Asia. (AP Photo/Jens Meyer)
Clouded leopard cubs Koshi, foreground, and Senja sit in their new habitat during their public debut at the Houston Zoo Thursday, Sept. 11, 2014, in Houston. The brothers were born at the zoo June 6. (AP PhotoPat Sullivan)
Clouded leopard cubs Koshi, foreground, and Senja sit in their new habitat during their public debut at the Houston Zoo Thursday, Sept. 11, 2014, in Houston. The brothers were born at the zoo June 6. (AP Photo/Pat Sullivan)
Clouded leopard cub Koshi peeks out from under a plant in his public debut at the Houston Zoo Thursday, Sept. 11, 2014, in Houston. The cub and his brother were born June 6 at the zoo. (AP PhotoPat Sullivan)
Clouded leopard cub Koshi peeks out from under a plant in his public debut at the Houston Zoo Thursday, Sept. 11, 2014, in Houston. The cub and his brother were born June 6 at the zoo. (AP Photo/Pat Sullivan)
Clouded leopard cubs Senja, left, and Koshi explore their new habitat during their public debut at the Houston Zoo Thursday, Sept. 11, 2014, in Houston. The brothers were born at the zoo June 6. (AP PhotoPat Sullivan)
Clouded leopard cubs Senja, left, and Koshi explore their new habitat during their public debut at the Houston Zoo Thursday, Sept. 11, 2014, in Houston. The brothers were born at the zoo June 6. (AP Photo/Pat Sullivan)
Four-year-old African lion mother Tajiri stands with her cubs during their debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born in late June at the zoo. (AP PhotoMatt Rourke)
Four-year-old African lion mother Tajiri stands with her cubs during their debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born in late June at the zoo. (AP Photo/Matt Rourke)
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An African lion cub runs during its debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born to four-year-old Tajiri in late June at the zoo. (AP PhotoMatt Rourke)
An African lion cub runs during its debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born to four-year-old Tajiri in late June at the zoo. (AP Photo/Matt Rourke)
African lion cubs sit in their enclosure during their debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born to four-year-old Tajiri in late June at the zoo. (AP PhotoMatt Rourke)
African lion cubs sit in their enclosure during their debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born to four-year-old Tajiri in late June at the zoo. (AP Photo/Matt Rourke)
Four-year-old African lion mother Tajiri plays with one of her cubs during their debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born to in late June at the zoo. (AP PhotoMatt Rourke)
Four-year-old African lion mother Tajiri plays with one of her cubs during their debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born to in late June at the zoo. (AP Photo/Matt Rourke)
Four-year-old African lion mother Tajiri stands with her cubs during their debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born in late June at the zoo. (AP PhotoMatt Rourke)
Four-year-old African lion mother Tajiri stands with her cubs during their debut at the Philadelphia Zoo Friday, Sept. 5, 2014, in Philadelphia. The four cubs were born in late June at the zoo. (AP Photo/Matt Rourke)
A zookeeper attempts to retrieve a notebook from the mouth of a white lion cub, as three sibling cubs are introduced to the public, at the Johannesburg Zoo, South Africa, Wednesday, Aug. 27, 2014. Three playful lion cubs made their public debut Wednesday, pouncing their way into a large enclosure at the Johannesburg Zoo. Their arrival heralds a new generation of lions at the zoo, which hasnt successfully bred the king of the jungle in five years. (AP PhotoDenis Farrell)
A zookeeper attempts to retrieve a notebook from the mouth of a white lion cub, as three sibling cubs are introduced to the public, at the Johannesburg Zoo, South Africa, Wednesday, Aug. 27, 2014. Three playful lion cubs made their public debut Wednesday, pouncing their way into a large enclosure at the Johannesburg Zoo. Their arrival heralds a new generation of lions at the zoo, which hasn't successfully bred the king of the jungle in five years. (AP Photo/Denis Farrell)
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A white lion cub holds a notebook in his mouth, as three sibling cubs are introduced to the public, at the Johannesburg Zoo, South Africa, Wednesday, Aug. 27, 2014. Three playful lion cubs made their public debut Wednesday, pouncing their way into a large enclosure at the Johannesburg Zoo. Their arrival heralds a new generation of lions at the zoo, which hasnt successfully bred the king of the jungle in five years. (AP PhotoDenis Farrell)
A white lion cub holds a notebook in his mouth, as three sibling cubs are introduced to the public, at the Johannesburg Zoo, South Africa, Wednesday, Aug. 27, 2014. Three playful lion cubs made their public debut Wednesday, pouncing their way into a large enclosure at the Johannesburg Zoo. Their arrival heralds a new generation of lions at the zoo, which hasn't successfully bred the king of the jungle in five years. (AP Photo/Denis Farrell)
A squirrel monkey looks into a photographers lens during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held its annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP PhotoKirsty Wigglesworth)
A squirrel monkey looks into a photographers lens during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held it's annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP Photo/Kirsty Wigglesworth)
A squirrel monkey looks into the camera during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held its annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP PhotoKirsty Wigglesworth)
A squirrel monkey looks into the camera during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held it's annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP Photo/Kirsty Wigglesworth)
A keeper attempts to weigh Cid, a Red Ruffed Lemur during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held its annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP PhotoKirsty Wigglesworth)
A keeper attempts to weigh Cid, a Red Ruffed Lemur during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held it's annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP Photo/Kirsty Wigglesworth)
A keeper measures Perry the Llama during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held its annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP PhotoKirsty Wigglesworth)
A keeper measures Perry the Llama during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held it's annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP Photo/Kirsty Wigglesworth)
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A mossy frog is weighed in a spoon during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held its annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP PhotoKirsty Wigglesworth)
A mossy frog is weighed in a spoon during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held it's annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP Photo/Kirsty Wigglesworth)
Kumbuka, a Silverback Western Lowland Gorilla sits next to a ruler during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held its annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP PhotoKirsty Wigglesworth)
Kumbuka, a Silverback Western Lowland Gorilla sits next to a ruler during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held it's annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP Photo/Kirsty Wigglesworth)
A squirrel monkey looks into a photographers lens during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held its annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP PhotoKirsty Wigglesworth)
A squirrel monkey looks into a photographers lens during a photocall at London Zoo, Thursday, Aug. 21, 2014. The Zoo held it's annual weigh-in where the vital statistics of animals were taken in an aid for keepers to detect pregnancies and check the animals general wellbeing. (AP Photo/Kirsty Wigglesworth)
Meerkat Manor in an enclosure at the Pretoria Zoo, South Africa, Wednesday, Aug. 13, 2014. One of the most captivating sights of African wildlife is that of sharp-eyed meerkats standing side-by-side on their hindlegs, as though posing for a group photograph. (AP PhotoThemba Hadebe )
Meerkat Manor in an enclosure at the Pretoria Zoo, South Africa, Wednesday, Aug. 13, 2014. One of the most captivating sights of African wildlife is that of sharp-eyed meerkats standing side-by-side on their hindlegs, as though posing for a group photograph. (AP Photo/Themba Hadebe )
Meerkat Manor leans against a tree trunk in an enclosure at the Pretoria Zoo, South Africa, Wednesday, Aug. 13, 2014. One of the most captivating sights of African wildlife is that of sharp-eyed meerkats standing side-by-side on their hindlegs, as though posing for a group photograph. (AP PhotoThemba Hadebe )
Meerkat Manor leans against a tree trunk in an enclosure at the Pretoria Zoo, South Africa, Wednesday, Aug. 13, 2014. One of the most captivating sights of African wildlife is that of sharp-eyed meerkats standing side-by-side on their hindlegs, as though posing for a group photograph. (AP Photo/Themba Hadebe )
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This undated photo issued by Chester Zoo shows tapir calf Zathras, who was born on Monday, Aug. 4, 2014 after a gestation period of around 13 months and is the first male tapir to be born at the zoo for eight years. (AP PhotoPA, Chester Zoo, Steve Rawlins)
This undated photo issued by Chester Zoo shows tapir calf Zathras, who was born on Monday, Aug. 4, 2014 after a gestation period of around 13 months and is the first male tapir to be born at the zoo for eight years. (AP Photo/PA, Chester Zoo, Steve Rawlins)
An elephant immerses behind a window in the elephants indoor pool at the Zoo in Leipzig, Germany, Tuesday, Aug. 5, 2014. (AP PhotoJens Meyer)
An elephant immerses behind a window in the elephants' indoor pool at the Zoo in Leipzig, Germany, Tuesday, Aug. 5, 2014. (AP Photo/Jens Meyer)
Xiao Liwu, a male giant panda, checks out his birthday cake - actually ice topped with a big ice 2 and filled with favorite treats including apples, carrot and yam slices - as he turns two years old Tuesday, July 29, 2014, at the San Diego Zoo. Xiao Liwus (pronounced sshyaoww lee woo) four-foot-tall, 100-pound cake was made by the Zoos nutritional services team. Xiao Liwu appeared to specifically enjoy the pieces of sliced apples, carrots and yams atop the cake, then patiently waited for the ice to melt so he could eat the fruit frozen into the ice tiers. The San Diego Zoo is home to three giant pandas Xiao Liwu, his mother, Bai Yun and father, Gao Gao. Giant pandas are on a research loan to the San Diego Zoo from the Peoples Republic of China. (AP PhotoSan Diego Zoo, Ken Bohn)
Xiao Liwu, a male giant panda, checks out his birthday cake - actually ice topped with a big ice "2" and filled with favorite treats including apples, carrot and yam slices - as he turns two years old Tuesday, July 29, 2014, at the San Diego Zoo. Xiao Liwu's (pronounced sshyaoww lee woo) four-foot-tall, 100-pound cake was made by the Zoo's nutritional services team. Xiao Liwu appeared to specifically enjoy the pieces of sliced apples, carrots and yams atop the cake, then patiently waited for the ice to melt so he could eat the fruit frozen into the ice tiers. The San Diego Zoo is home to three giant pandas: Xiao Liwu, his mother, Bai Yun and father, Gao Gao. Giant pandas are on a research loan to the San Diego Zoo from the People's Republic of China. (AP Photo/San Diego Zoo, Ken Bohn)
A river otter stands up after hitting the waterslide at Ichikawa Zoological and Botanical Garden in Ichikawa, east of Tokyo, Wednesday, July 30, 2014. Playful otters spend their time swimming and playing in the waterslide that was built two years ago in commemoration of the 25th anniversary of the zoo for the mammals to beat the summer heat. (AP PhotoKoji Ueda)
A river otter stands up after hitting the waterslide at Ichikawa Zoological and Botanical Garden in Ichikawa, east of Tokyo, Wednesday, July 30, 2014. Playful otters spend their time swimming and playing in the waterslide that was built two years ago in commemoration of the 25th anniversary of the zoo for the mammals to beat the summer heat. (AP Photo/Koji Ueda)
River otters hit the waterslide one after the other at Ichikawa Zoological and Botanical Garden in Ichikawa, east of Tokyo, Wednesday, July 30, 2014. Playful otters spend their time swimming and playing in the waterslide that was built two years ago in commemoration of the 25th anniversary of the zoo for the mammals to beat the summer heat. (AP PhotoKoji Ueda)
River otters hit the waterslide one after the other at Ichikawa Zoological and Botanical Garden in Ichikawa, east of Tokyo, Wednesday, July 30, 2014. Playful otters spend their time swimming and playing in the waterslide that was built two years ago in commemoration of the 25th anniversary of the zoo for the mammals to beat the summer heat. (AP Photo/Koji Ueda)
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A river otter greets a visitor at Ichikawa Zoological and Botanical Garden in Ichikawa, east of Tokyo, Wednesday, July 30, 2014. Playful otters spend their time swimming and playing in the waterslide that was built two years ago in commemoration of the 25th anniversary of the zoo for the carnivorous mammals to beat the summer heat. (AP PhotoKoji Ueda
A river otter greets a visitor at Ichikawa Zoological and Botanical Garden in Ichikawa, east of Tokyo, Wednesday, July 30, 2014. Playful otters spend their time swimming and playing in the waterslide that was built two years ago in commemoration of the 25th anniversary of the zoo for the carnivorous mammals to beat the summer heat. (AP Photo/Koji Ueda
Piko, a spotted-neck otter, eats a frozen fish at the Phoenix Zoo, Thursday, July 24, 2014 in Phoenix. With Phoenix-area daytime highs hovering around 110, zoo officials use a variety of frozen snacks and spring to keep the animals cool. (AP PhotoMatt York)
Piko, a spotted-neck otter, eats a frozen fish at the Phoenix Zoo, Thursday, July 24, 2014 in Phoenix. With Phoenix-area daytime highs hovering around 110, zoo officials use a variety of frozen snacks and spring to keep the animals cool. (AP Photo/Matt York)
Reptile manager Paula Swanson sprays down Jake, a Galapagos tortoise, at the Phoenix Zoo, Thursday, July 24, 2014, in Phoenix. With Phoenix-area daytime highs hovering around 110, zoo officials use a variety of frozen snacks and sprayed water to keep the animals cool. (AP PhotoMatt York)
Reptile manager Paula Swanson sprays down Jake, a Galapagos tortoise, at the Phoenix Zoo, Thursday, July 24, 2014, in Phoenix. With Phoenix-area daytime highs hovering around 110, zoo officials use a variety of frozen snacks and sprayed water to keep the animals cool. (AP Photo/Matt York)
In this Sunday, July 20, 2014 photo provided by the Chicago Zoological Society, Kecil, a 6-month-old orangutan, is seen at the Brookfield Zoo in Brookfield, Ill., with his surrogate mother named Maggie, a 53-year-old Bornean orangutan and has had experience serving as a surrogate in the past. Kecil, who was born at Toledo Zoo in January, was recently brought to Brookfield to be introduced to Maggie. The two are currently off exhibit bonding and it will be several months before they are on exhibit in the zoos Tropic World Asia exhibit. (AP PhotoChicago Zoological Society, Jim Schulz)
In this Sunday, July 20, 2014 photo provided by the Chicago Zoological Society, Kecil, a 6-month-old orangutan, is seen at the Brookfield Zoo in Brookfield, Ill., with his surrogate mother named Maggie, a 53-year-old Bornean orangutan and has had experience serving as a surrogate in the past. Kecil, who was born at Toledo Zoo in January, was recently brought to Brookfield to be introduced to Maggie. The two are currently off exhibit bonding and it will be several months before they are on exhibit in the zoo's Tropic World: Asia exhibit. (AP Photo/Chicago Zoological Society, Jim Schulz)
In this July 14, 2014 photo provided by the Chicago Zoological Society, Kecil, a 6-month-old orangutan, is seen at the Brookfield Zoo in Brookfield, Ill. Kecil was recently brought to Brookfield to be introduced to a surrogate mother named Maggie, a 53-year-old Bornean orangutan and has had experience serving as a surrogate in the past. Kecil was born at Toledo Zoo in January, but his mother was not providing him with the proper care. (AP PhotoChicago Zoological Society, Jim Schulz)
In this July 14, 2014 photo provided by the Chicago Zoological Society, Kecil, a 6-month-old orangutan, is seen at the Brookfield Zoo in Brookfield, Ill. Kecil was recently brought to Brookfield to be introduced to a surrogate mother named Maggie, a 53-year-old Bornean orangutan and has had experience serving as a surrogate in the past. Kecil was born at Toledo Zoo in January, but his mother was not providing him with the proper care. (AP Photo/Chicago Zoological Society, Jim Schulz)
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In this Monday, June 30, 2014, photo provided by the San Diego Zoo, a two-month-old grey wolf pup plays and rolls around in some ficus browse that keepers laid out for him to smell and chew on at the San Diego Zoo in San Diego, Calif. Animal care staff members are introducing the wolf pup, named Shadow, to various smells and sights during the 30-day quarantine process, helping him prepare for his new role as an animal ambassador. Once Shadow completes the quarantine period, he will live at Wegeforth Bowl and serve as an animal ambassador during educational presentations. (AP PhotoSan Diego Zoo, Ken Bohn)
In this Monday, June 30, 2014, photo provided by the San Diego Zoo, a two-month-old grey wolf pup plays and rolls around in some ficus browse that keepers laid out for him to smell and chew on at the San Diego Zoo in San Diego, Calif. Animal care staff members are introducing the wolf pup, named Shadow, to various smells and sights during the 30-day quarantine process, helping him prepare for his new role as an animal ambassador. Once Shadow completes the quarantine period, he will live at Wegeforth Bowl and serve as an animal ambassador during educational presentations. (AP Photo/San Diego Zoo, Ken Bohn)
In this Monday, June 30, 2014, photo provided by the San Diego Zoo, a two-month-old grey wolf pup plays and rolls around in some ficus browse that keepers laid out for him to smell and chew on at the San Diego Zoo in San Diego, Calif. Animal care staff members are introducing the wolf pup, named Shadow, to various smells and sights during the 30-day quarantine process, helping him prepare for his new role as an animal ambassador. Once Shadow completes the quarantine period, he will live at Wegeforth Bowl and serve as an animal ambassador during educational presentations. (AP PhotoSan Diego Zoo, Ken Bohn)
In this Monday, June 30, 2014, photo provided by the San Diego Zoo, a two-month-old grey wolf pup plays and rolls around in some ficus browse that keepers laid out for him to smell and chew on at the San Diego Zoo in San Diego, Calif. Animal care staff members are introducing the wolf pup, named Shadow, to various smells and sights during the 30-day quarantine process, helping him prepare for his new role as an animal ambassador. Once Shadow completes the quarantine period, he will live at Wegeforth Bowl and serve as an animal ambassador during educational presentations. (AP PhotoSan Diego Zoo, Ken Bohn)
The San Diego Zoo Safari Parks 7-week-old cheetah cub Ruuxa is getting to know his new dog companion as the two continue to bond and spend time at the Safari Parks Animal Care Center. The 8-week-old Rhodesian ridgeback puppy was paired with the cub after the cheetah was rejected by his mother and had to be hand raised as an animal ambassador. The cheetah and puppy will be raised together and the dog will serve as a lifelong companion to the cheetah. Safari Park cheetahs selected for training as ambassadors are paired early in life with a domestic dog. As the two companions grow up together, the dogs body language will communicate to the cheetah that theres nothing to fear in new or public surroundings, which relaxes and calms the cheetah. The Safari Park currently has four cheetah ambassadors all of which are trained to participate in the Parks Cheetah Run experience. (AP PhotoSan Diego Zoo Safari Park)
The San Diego Zoo Safari Park's 7-week-old cheetah cub Ruuxa is getting to know his new dog companion as the two continue to bond and spend time at the Safari Park's Animal Care Center. The 8-week-old Rhodesian ridgeback puppy was paired with the cub after the cheetah was rejected by his mother and had to be hand raised as an animal ambassador. The cheetah and puppy will be raised together and the dog will serve as a lifelong companion to the cheetah. Safari Park cheetahs selected for training as ambassadors are paired early in life with a domestic dog. As the two companions grow up together, the dog's body language will communicate to the cheetah that there's nothing to fear in new or public surroundings, which relaxes and calms the cheetah. The Safari Park currently has four cheetah ambassadors all of which are trained to participate in the Park's Cheetah Run experience. (AP Photo/San Diego Zoo Safari Park)
The Philadelphia Zoo welcomed the first three black-footed cat kittens ever born at the zoo in April. (Courtesy Philadelphia Zoo)
The Philadelphia Zoo welcomed the first three black-footed cat kittens ever born at the zoo in April. (Courtesy Philadelphia Zoo)
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A month-old cheetah cub shows its teeth as its sibling crouches behind at the private Attica Zoological Park, in Spata, east of Athens, on Friday, May 30, 2014. The cubs, a male and a female that weigh about 1.5 kilos (3.3 kilos) each, have not yet been named. Zoo officials say cheetah breeding in captivity is a difficult enterprise, as males and females which live separately in their natural environment are kept apart and newly-born cubs are vulnerable to illness and dietary problems. (AP PhotoThanassis Stavrakis)
A month-old cheetah cub shows its teeth as its sibling crouches behind at the private Attica Zoological Park, in Spata, east of Athens, on Friday, May 30, 2014. The cubs, a male and a female that weigh about 1.5 kilos (3.3 kilos) each, have not yet been named. Zoo officials say cheetah breeding in captivity is a difficult enterprise, as males and females _ which live separately in their natural environment _ are kept apart and newly-born cubs are vulnerable to illness and dietary problems. (AP Photo/Thanassis Stavrakis)
Two 30-day-old cheetah cubs crouch on the grass at the private Attica Zoological Park, in Spata, east of Athens, on Friday, May 30, 2014. The cubs, a male and a female that weigh about 1.5 kilos (3.3 kilos) each, have not yet been named. Zoo officials say cheetah breeding in captivity is a difficult enterprise, as males and females which live separately in their natural environment are kept apart and newly-born cubs are vulnerable to illness and dietary problems. (AP PhotoThanassis Stavrakis)
Two 30-day-old cheetah cubs crouch on the grass at the private Attica Zoological Park, in Spata, east of Athens, on Friday, May 30, 2014. The cubs, a male and a female that weigh about 1.5 kilos (3.3 kilos) each, have not yet been named. Zoo officials say cheetah breeding in captivity is a difficult enterprise, as males and females _ which live separately in their natural environment _ are kept apart and newly-born cubs are vulnerable to illness and dietary problems. (AP Photo/Thanassis Stavrakis)
In this Tuesday, May 20, 2014 photo, a female baby sloth peeks out from behind a door on a floating house in the Lago do Janauari near Manaus, Brazil. The sloth was captured by the owner of the floating house, who makes a living showing local fauna to visitors. In an an attempt to prevent any harm to the animals he says he only keeps each animal for a few weeks before returning it to its natural habitat. (AP PhotoFelipe Dana)
In this Tuesday, May 20, 2014 photo, a female baby sloth peeks out from behind a door on a floating house in the 'Lago do Janauari' near Manaus, Brazil. The sloth was captured by the owner of the floating house, who makes a living showing local fauna to visitors. In an an attempt to prevent any harm to the animals he says he only keeps each animal for a few weeks before returning it to it's natural habitat. (AP Photo/Felipe Dana)
Rizki, 10 months orphaned Bornean orang utan learns to bite at Surabaya Zoo as he prepares to be released into the wild on May 19, 2014 in Surabaya, Indonesia. Damai (3) and Rizki (10 months), two orangutan brothers who were abandoned by their mother Dora (13) shortly after birth. They were born in Surabaya Zoo and have managed to survive thanks to the special care unit keeper of Surabaya Zoo who has taken care of both since birth until today. Zookeepers hand-reared the little orphans, putting shirts and diapers, feeding them milk and mashed banana to keep their strength up. Now they are beginning to learn to live independently so that one day they may be released into the wild. (Photo by Robertus PudyantoGetty Images)
Rizki, 10 months orphaned Bornean orang utan learns to bite at Surabaya Zoo as he prepares to be released into the wild on May 19, 2014 in Surabaya, Indonesia. Damai (3) and Rizki (10 months), two orangutan brothers who were abandoned by their mother Dora (13) shortly after birth. They were born in Surabaya Zoo and have managed to survive thanks to the special care unit keeper of Surabaya Zoo who has taken care of both since birth until today. Zookeepers hand-reared the little orphans, putting shirts and diapers, feeding them milk and mashed banana to keep their strength up. Now they are beginning to learn to live independently so that one day they may be released into the wild. (Photo by Robertus Pudyanto/Getty Images)
Rizki, 10 months orphaned Bornean orang utan learns to bite at Surabaya Zoo as he prepares to be released into the wild on May 19, 2014 in Surabaya, Indonesia. Damai (3) and Rizki (10 months), two orangutan brothers who were abandoned by their mother Dora (13) shortly after birth. They were born in Surabaya Zoo and have managed to survive thanks to the special care unit keeper of Surabaya Zoo who has taken care of both since birth until today. Zookeepers hand-reared the little orphans, putting shirts and diapers, feeding them milk and mashed banana to keep their strength up. Now they are beginning to learn to live independently so that one day they may be released into the wild. (Photo by Robertus PudyantoGetty Images)
Rizki, 10 months orphaned Bornean orang utan learns to bite at Surabaya Zoo as he prepares to be released into the wild on May 19, 2014 in Surabaya, Indonesia. Damai (3) and Rizki (10 months), two orangutan brothers who were abandoned by their mother Dora (13) shortly after birth. They were born in Surabaya Zoo and have managed to survive thanks to the special care unit keeper of Surabaya Zoo who has taken care of both since birth until today. Zookeepers hand-reared the little orphans, putting shirts and diapers, feeding them milk and mashed banana to keep their strength up. Now they are beginning to learn to live independently so that one day they may be released into the wild. (Photo by Robertus Pudyanto/Getty Images)
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Mike Sczuks of Sczuka Saucze and Center Street Farms sent Dave Johnson this tweet about piglets born at his Rappahannock County farm.
Mike Sczuks of Sczuka Saucze and Center Street Farms sent Dave Johnson this tweet about piglets born at his Rappahannock County farm.
Fairfax County police say this tiny fox was tangled in some vines. Animal control officers came to the rescue, setting the fox free. (Courtesy Fairfax County Police)
Fairfax County police say this tiny fox was tangled in some vines. Animal control officers came to the rescue, setting the fox free. (Courtesy Fairfax County Police)
A four weeks old ring-tailed lemur (Lemur catta) relaxes the mothers back in the Zoo in Erfurt, central Germany, Tuesday, April 22, 2014. (AP PhotoJens Meyer)
A four weeks old ring-tailed lemur (Lemur catta) relaxes the mother's back in the Zoo in Erfurt, central Germany, Tuesday, April 22, 2014. (AP Photo/Jens Meyer)
A four weeks old ring-tailed lemur (Lemur catta) plays in the Zoo in Erfurt, central Germany, Tuesday, April 22, 2014. (AP PhotoJens Meyer)
A four weeks old ring-tailed lemur (Lemur catta) plays in the Zoo in Erfurt, central Germany, Tuesday, April 22, 2014. (AP Photo/Jens Meyer)
A four weeks old ring-tailed lemur (Lemur catta) plays in front of the mother in the Zoo in Erfurt, central Germany, Tuesday, April 22, 2014. (AP PhotoJens Meyer)
A four weeks old ring-tailed lemur (Lemur catta) plays in front of the mother in the Zoo in Erfurt, central Germany, Tuesday, April 22, 2014. (AP Photo/Jens Meyer)
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A sniffer dog equipped with a camera is restrained by a Dutch soldier during a training exercise inside the World Forum congress center, the venue of the Nuclear Security Summit in The Hague Netherlands, Tuesday, March 18, 2014. The aim of the March 24-25 NSS summit is to reduce the amount of nuclear material in the world and improve its security. Fifty-three countries and four international organizations are taking part in the negotiations. The images can be viewed remotely. (AP PhotoFreek van den Bergh, Pool)
A sniffer dog equipped with a camera is restrained by a Dutch soldier during a training exercise inside the World Forum congress center, the venue of the Nuclear Security Summit in The Hague Netherlands, Tuesday, March 18, 2014. The aim of the March 24-25 NSS summit is to reduce the amount of nuclear material in the world and improve its security. Fifty-three countries and four international organizations are taking part in the negotiations. The images can be viewed remotely. (AP Photo/Freek van den Bergh, Pool)
Domhnall the Irish Wolfhound wears a shamrock after being presented it by Kate, The Duchess of Cambridge during a visit to the 1st Battalion Irish Guards at the St. Patricks Day Parade at Mons Barracks, Aldershot, in England, Monday, March 17, 2014. The Duke of Cambridge attended the Parade as Colonel of the Regiment. The Duchess of Cambridge presented the traditional sprigs of shamrocks to the Officers and Guardsmen of the Regiment. (AP PhotoKirsty Wigglesworth)
Domhnall the Irish Wolfhound wears a shamrock after being presented it by Kate, The Duchess of Cambridge during a visit to the 1st Battalion Irish Guards at the St. Patrick's Day Parade at Mons Barracks, Aldershot, in England, Monday, March 17, 2014. The Duke of Cambridge attended the Parade as Colonel of the Regiment. The Duchess of Cambridge presented the traditional sprigs of shamrocks to the Officers and Guardsmen of the Regiment. (AP Photo/Kirsty Wigglesworth)
Domhnall the Irish Wolfhound wears a shamrock after being presented it by Kate, The Duchess of Cambridge during a visit to the 1st Battalion Irish Guards at the St. Patricks Day Parade at Mons Barracks, Aldershot, in England, Monday, March 17, 2014. The Duke of Cambridge attended the Parade as Colonel of the Regiment. The Duchess of Cambridge presented the traditional sprigs of shamrocks to the Officers and Guardsmen of the Regiment. (AP PhotoKirsty Wigglesworth)
Domhnall the Irish Wolfhound wears a shamrock after being presented it by Kate, The Duchess of Cambridge during a visit to the 1st Battalion Irish Guards at the St. Patrick's Day Parade at Mons Barracks, Aldershot, in England, Monday, March 17, 2014. The Duke of Cambridge attended the Parade as Colonel of the Regiment. The Duchess of Cambridge presented the traditional sprigs of shamrocks to the Officers and Guardsmen of the Regiment. (AP Photo/Kirsty Wigglesworth)
Kate, The Duchess of Cambridge strokes Domhnall the Irish Wolfhound before presenting him with a shamrock, during a visit to the 1st Battalion Irish Guards at the St. Patricks Day Parade at Mons Barracks, Aldershot, in England, Monday, March 17, 2014. The Duke of Cambridge attended the Parade as Colonel of the Regiment. The Duchess of Cambridge presented the traditional sprigs of shamrocks to the Officers and Guardsmen of the Regiment. (AP PhotoKirsty Wigglesworth)
Kate, The Duchess of Cambridge strokes Domhnall the Irish Wolfhound before presenting him with a shamrock, during a visit to the 1st Battalion Irish Guards at the St. Patrick's Day Parade at Mons Barracks, Aldershot, in England, Monday, March 17, 2014. The Duke of Cambridge attended the Parade as Colonel of the Regiment. The Duchess of Cambridge presented the traditional sprigs of shamrocks to the Officers and Guardsmen of the Regiment. (AP Photo/Kirsty Wigglesworth)
In this handout image provided by Taronga Zoo, an unnamed baby Goodfellows Tree Kangaroo joey is seen in its mothers pouch on March 10, 2014 in Sydney, Australia. Taronga Zoo is celebrating the successful birth of its first Goodfellows Tree Kangaroo joey in more than 20 years. Zookeepers have only just begun seeing her peeking out from first-time mother, Qwikilas, pouch after she was born in September last year. (Photo by Taronga Zoo via Getty Images)
In this handout image provided by Taronga Zoo, an unnamed baby Goodfellows Tree Kangaroo joey is seen in it's mothers pouch on March 10, 2014 in Sydney, Australia. Taronga Zoo is celebrating the successful birth of its first Goodfellows Tree Kangaroo joey in more than 20 years. Zookeepers have only just begun seeing her peeking out from first-time mother, Qwikilas, pouch after she was born in September last year. (Photo by Taronga Zoo via Getty Images)
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In this handout image provided by Taronga Zoo, an unnamed baby Goodfellows Tree Kangaroo joey is seen in its mothers pouch on March 10, 2014 in Sydney, Australia. Taronga Zoo is celebrating the successful birth of its first Goodfellows Tree Kangaroo joey in more than 20 years. Zookeepers have only just begun seeing her peeking out from first-time mother, Qwikilas, pouch after she was born in September last year. (Photo by Taronga Zoo via Getty Images)
In this handout image provided by Taronga Zoo, an unnamed baby Goodfellows Tree Kangaroo joey is seen in it's mothers pouch on March 10, 2014 in Sydney, Australia. Taronga Zoo is celebrating the successful birth of its first Goodfellows Tree Kangaroo joey in more than 20 years. Zookeepers have only just begun seeing her peeking out from first-time mother, Qwikilas, pouch after she was born in September last year. (Photo by Taronga Zoo via Getty Images)
A dog sniffs at Fuleco, the official mascot of the 2014 FIFA World Cup, during the Blocao dog carnival in Rio de Janeiro, Brazil, Sunday, Feb. 16, 2014. About 100 dogs have had their day at a pre-Carnival bash in Rio de Janeiro. A 10-man brass band and a singer belting out Rios anthem song Cidade Maravilhosa (Marvelous City) kicked off the four-footed fest as dog owners gathered to party down with pooches on Copacabana beach Sunday. (AP PhotoSilvia Izquierdo)
A dog sniffs at "Fuleco", the official mascot of the 2014 FIFA World Cup, during the "Blocao" dog carnival in Rio de Janeiro, Brazil, Sunday, Feb. 16, 2014. About 100 dogs have had their day at a pre-Carnival bash in Rio de Janeiro. A 10-man brass band and a singer belting out Rio's anthem song "Cidade Maravilhosa" (Marvelous City) kicked off the four-footed fest as dog owners gathered to party down with pooches on Copacabana beach Sunday. (AP Photo/Silvia Izquierdo)
The carcass of Marius, a male giraffe, is eaten by lions after he was put down in Copenhagen Zoo on Sunday, Feb. 9, 2014. Copenhagen Zoo turned down offers from other zoos and 500,000 euros (680,000) from a private individual to save the life of a healthy giraffe before killing and slaughtering it Sunday to follow inbreeding recommendations made by a European association. The 2-year-old male giraffe, named Marius, was put down using a bolt pistol and its meat will be fed to carnivores at the zoo, spokesman Tobias Stenbaek Bro said. Visitors, including children, were invited to watch while the giraffe was dissected. (AP PhotoPOLFOTO, Rasmus Flindt Pedersen)
The carcass of Marius, a male giraffe, is eaten by lions after he was put down in Copenhagen Zoo on Sunday, Feb. 9, 2014. Copenhagen Zoo turned down offers from other zoos and 500,000 euros ($680,000) from a private individual to save the life of a healthy giraffe before killing and slaughtering it Sunday to follow inbreeding recommendations made by a European association. The 2-year-old male giraffe, named Marius, was put down using a bolt pistol and its meat will be fed to carnivores at the zoo, spokesman Tobias Stenbaek Bro said. Visitors, including children, were invited to watch while the giraffe was dissected. (AP Photo/POLFOTO, Rasmus Flindt Pedersen)
Mimi, 5, a Britney Spaniel rescue dog, demonstrates skills for the upcoming agility competition as part of the Westminster Dog Show on February 6, 2014 at Madison Square Garden in New York City. This is the first year for the Masters Agility Championship at Westminster to be held this Saturday at Pier 94 in New York, ahead of the big event - the 138th Annual Westminster Kennel Club Dog Show. (Photo by John MooreGetty Images)
Mimi, 5, a Britney Spaniel rescue dog, demonstrates skills for the upcoming agility competition as part of the Westminster Dog Show on February 6, 2014 at Madison Square Garden in New York City. This is the first year for the Masters Agility Championship at Westminster to be held this Saturday at Pier 94 in New York, ahead of the big event - the 138th Annual Westminster Kennel Club Dog Show. (Photo by John Moore/Getty Images)
An eight-week-old lion cub shows its teeth at the private Attica Zoological Park, in Spata, east of Athens, on Thursday, January 30, 2014. The parks three lion cubs, two males and a female who have not yet been given names are still suckling from their mother. The park is a popular attraction for children. (AP PhotoThanassis Stavrakis)
An eight-week-old lion cub shows its teeth at the private Attica Zoological Park, in Spata, east of Athens, on Thursday, January 30, 2014. The park's three lion cubs, two males and a female who have not yet been given names are still suckling from their mother. The park is a popular attraction for children. (AP Photo/Thanassis Stavrakis)
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An anhinga suns at the Wakodahatchee Wetlands in Delray Beach, Fla., Monday, Jan. 27, 2014. It is nesting season for many birds in the wetlands. Over 140 species of birds have been spotted at the Wakodahatchee Wetlands. The name is derived from the Seminole Indian Language and translates as created waters. Fifty acres of unused utilities land have been transformed into a wetlands ecosystem. (AP PhotoJ Pat Carter)
An anhinga suns at the Wakodahatchee Wetlands in Delray Beach, Fla., Monday, Jan. 27, 2014. It is nesting season for many birds in the wetlands. Over 140 species of birds have been spotted at the Wakodahatchee Wetlands. The name is derived from the Seminole Indian Language and translates as "created waters." Fifty acres of unused utilities land have been transformed into a wetlands ecosystem. (AP Photo/J Pat Carter)
The National Zoos two African lion cubs spend time with their mother Nababiep in their den. The cubs were born Jan. 24, the first litter at the National Zoo in four years. They appear to be nursing, moving and vocalizing well. Cub fans can watch the family on the lion cam. (National Zoo)
The National Zoo's two African lion cubs spend time with their mother Nababiep in their den. The cubs were born Jan. 24, the first litter at the National Zoo in four years. They appear to be nursing, moving and vocalizing well. Cub fans can watch the family on the lion cam. (National Zoo)
Ducks advance in a row on a partially frozen lake in Bucharest, Romania, Sunday, Jan. 26, 2014. Heavy snow storms affected for a second day the southeastern regions of Romania leading to delays in the railway and air traffic, cancellation of 60 trains, closure of roads and prompted the authorities to halt all heavy traffic and close schools in affected areas until the weather improves.(AP PhotoVadim Ghirda)
Ducks advance in a row on a partially frozen lake in Bucharest, Romania, Sunday, Jan. 26, 2014. Heavy snow storms affected for a second day the southeastern regions of Romania leading to delays in the railway and air traffic, cancellation of 60 trains, closure of roads and prompted the authorities to halt all heavy traffic and close schools in affected areas until the weather improves.(AP Photo/Vadim Ghirda)
A female resident orca whale breaches while swimming in Puget Sound near Bainbridge Island as seen from a federally permitted research vessel Saturday, Jan. 18, 2014. Researchers from the National Oceanic and Atmospheric Administration followed about two dozen of the killer whales from J pod through the Sound Saturday after being alerted to their presence the night before from whale L-87, who carries a satellite-linked tag. L-87 was tagged by NOAA several weeks ago as part of ongoing research on the southern resident killer whales. (AP PhotoElaine Thompson)
A female resident orca whale breaches while swimming in Puget Sound near Bainbridge Island as seen from a federally permitted research vessel Saturday, Jan. 18, 2014. Researchers from the National Oceanic and Atmospheric Administration followed about two dozen of the killer whales from J pod through the Sound Saturday after being alerted to their presence the night before from whale L-87, who carries a satellite-linked tag. L-87 was tagged by NOAA several weeks ago as part of ongoing research on the southern resident killer whales. (AP Photo/Elaine Thompson)
A six and a half month old koala joey is held by a zoo keeper before being weighed for the first time, at Duisburg Zoo in Germany, Wednesday, Jan. 22, 2014. The female koala has not yet been named and the zoo is asking fans to vote for a name on a social networking site. (AP PhotoFrank Augstein)
A six and a half month old koala joey is held by a zoo keeper before being weighed for the first time, at Duisburg Zoo in Germany, Wednesday, Jan. 22, 2014. The female koala has not yet been named and the zoo is asking fans to vote for a name on a social networking site. (AP Photo/Frank Augstein)
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A six and a half month old koala joey sits on the mother Eoras back during a media opportunity at Duisburg Zoo in Germany, Wednesday, Jan. 22, 2014. The female koala has not yet been named and the zoo is asking fans to vote for a name on a social networking site. (AP PhotoFrank Augstein)
A six and a half month old koala joey sits on the mother Eora's back during a media opportunity at Duisburg Zoo in Germany, Wednesday, Jan. 22, 2014. The female koala has not yet been named and the zoo is asking fans to vote for a name on a social networking site. (AP Photo/Frank Augstein)
A Meerkat inspects an abacus as a keeper counts them during a stocktake at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, zookeepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoos zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorilla is duly noted.(AP PhotoKirsty Wigglesworth)
A Meerkat inspects an abacus as a keeper counts them during a stocktake at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, zookeepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoo's zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorilla is duly noted.(AP Photo/Kirsty Wigglesworth)
Keeper Jamie Pearce inspects eagle owl Max in his enclosure at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, Londons zookeepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoos zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorilla is duly noted.(AP PhotoKirsty Wigglesworth)
Keeper Jamie Pearce inspects eagle owl Max in his enclosure at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, London's zookeepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoo's zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorilla is duly noted.(AP Photo/Kirsty Wigglesworth)
A penguin looks at a keepers clipboard during a stocktake at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, London zookeepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoos zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorilla is duly noted .(AP PhotoKirsty Wigglesworth)
A penguin looks at a keeper's clipboard during a stocktake at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, London zookeepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoo's zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorilla is duly noted .(AP Photo/Kirsty Wigglesworth)
A penguin pecks a keepers clipboard during a stock take at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, zoo keepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoos zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorillas is duly noted and accounted for. (AP PhotoKirsty Wigglesworth)
A penguin pecks a keeper's clipboard during a stock take at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, zoo keepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoo's zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorillas is duly noted and accounted for. (AP Photo/Kirsty Wigglesworth)
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A penguin swims past as a keeper counts the birds during a stock take at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, zoo keepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoos zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorillas is duly noted and accounted for. (AP PhotoKirsty Wigglesworth)
A penguin swims past as a keeper counts the birds during a stock take at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, zoo keepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoo's zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorillas is duly noted and accounted for. (AP Photo/Kirsty Wigglesworth)
Kumbuka, a male silverback gorilla sits next to the keepers chalk board in his enclosure at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, zoo keepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoos zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorilla is duly noted and accounted for. (AP PhotoKirsty Wigglesworth)
Kumbuka, a male silverback gorilla sits next to the keeper's chalk board in his enclosure at London Zoo, Thursday, Jan. 2, 2014. Home to more than 850 different species, zoo keepers welcomed in the New Year armed with clipboards as they made a note of every single animal. The compulsory annual count is required as part of ZSL London Zoo's zoo license, and every creature, from the tiny leaf cutter ants to the huge silverback gorilla is duly noted and accounted for. (AP Photo/Kirsty Wigglesworth)
Inuka, the first polar bear born in the tropics is left with a whipped cream mustache as he eats his birthday cake in his enclosure at the Singapore Zoo, Thursday, Dec. 26, 2013, in Sinagpore. Inuka celebrated his 23rd birthday with a cake made of ice blocks embedded with a mixture of salmon, apples, berries, whipped cream and a stalk of mulberry leaves.(AP PhotoWong Maye-E)
Inuka, the first polar bear born in the tropics is left with a "whipped cream mustache" as he eats his birthday cake in his enclosure at the Singapore Zoo, Thursday, Dec. 26, 2013, in Sinagpore. Inuka celebrated his 23rd birthday with a cake made of ice blocks embedded with a mixture of salmon, apples, berries, whipped cream and a stalk of mulberry leaves.(AP Photo/Wong Maye-E)
Inuka, the first polar bear born in the tropics eats his birthday cake in his enclosure at the Singapore Zoo, Thursday, Dec. 26, 2013, in Sinagpore. Inuka celebrated his 23rd birthday with a cake made of ice blocks embedded with a mixture of salmon, apples, berries, whipped cream and a stalk of mulberry leaves.(AP PhotoWong Maye-E)
Inuka, the first polar bear born in the tropics eats his birthday cake in his enclosure at the Singapore Zoo, Thursday, Dec. 26, 2013, in Sinagpore. Inuka celebrated his 23rd birthday with a cake made of ice blocks embedded with a mixture of salmon, apples, berries, whipped cream and a stalk of mulberry leaves.(AP Photo/Wong Maye-E)
A distorted view of Inuka, the first polar bear born in the tropics is seen through glass, as he eats his birthday cake in his enclosure at the Singapore Zoo, Thursday, Dec. 26, 2013, in Sinagpore. Inuka celebrated his 23rd birthday with a cake made of ice blocks embedded with a mixture of salmon, apples, berries, whipped cream and a stalk of mulberry leaves.(AP PhotoWong Maye-E)
A distorted view of Inuka, the first polar bear born in the tropics is seen through glass, as he eats his birthday cake in his enclosure at the Singapore Zoo, Thursday, Dec. 26, 2013, in Sinagpore. Inuka celebrated his 23rd birthday with a cake made of ice blocks embedded with a mixture of salmon, apples, berries, whipped cream and a stalk of mulberry leaves.(AP Photo/Wong Maye-E)
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Namayca Bauer performs with her animals during the Circus Krone Christmas Show at Circus Krone on December 25, 2013 in Munich, Germany. (Photo by Hannes MagerstaedtGetty Images)
Namayca Bauer performs with her animals during the Circus Krone Christmas Show at Circus Krone on December 25, 2013 in Munich, Germany. (Photo by Hannes Magerstaedt/Getty Images)
Jana Mandana perfoms with her elephants during the Circus Krone Christmas Show at Circus Krone on December 25, 2013 in Munich, Germany. (Photo by Hannes MagerstaedtGetty Images)
Jana Mandana perfoms with her elephants during the Circus Krone Christmas Show at Circus Krone on December 25, 2013 in Munich, Germany. (Photo by Hannes Magerstaedt/Getty Images)
The Prince William County Animal Shelter posted a photo of this bundled up bunny on its Facebook page Dec. 12 The bunny (SAR 5406) is looking for someone to cuddle up with this winter. He also has several other bunny friends at the shelter looking for a home. Please come by and visit. Learn more about adopting this bunny or other animals on their website. (Courtesy Prince William County Animal Shelter)
The Prince William County Animal Shelter posted a photo of this bundled up bunny on its Facebook page Dec. 12: "The bunny (SAR# 5406) is looking for someone to cuddle up with this winter. He also has several other bunny friends at the shelter looking for a home. Please come by and visit."

Learn more about adopting this bunny or other animals on their website.

(Courtesy Prince William County Animal Shelter)
Adorable New mother Giovanna cuddles wither her twin cubs, born on Dec. 11 at the Muenchener Tierpark Hellabrunn zoo on December 11, 2013 in Munich, Germany. Watch the video and click through the pics to see some close-ups.
Adorable! New mother Giovanna cuddles wither her twin cubs, born on Dec. 11 at the Muenchener Tierpark Hellabrunn zoo on December 11, 2013 in Munich, Germany. Watch the video and click through the pics to see some close-ups.
Screenshot of a video from December 9, 2013 released by the Muenchener Tierpark Hellabrunn zoo shows two new born polar bears cuddling with their mother Giovanna at the Muenchener Tierpark Hellabrunn zoo on December 11, 2013 in Munich, Germany. The two cubs, who have yet to be named, were born on December 9 to Giovanna and father Yoghi. (Photo by Lennart PreissGetty Images)
Screenshot of a video from December 9, 2013 released by the Muenchener Tierpark Hellabrunn zoo shows two new born polar bears cuddling with their mother Giovanna at the Muenchener Tierpark Hellabrunn zoo on December 11, 2013 in Munich, Germany. The two cubs, who have yet to be named, were born on December 9 to Giovanna and father Yoghi. (Photo by Lennart Preiss/Getty Images)
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Screenshot of a video from December 9, 2013 released by the Muenchener Tierpark Hellabrunn zoo shows two new born polar bears cuddling with their mother Giovanna at the Muenchener Tierpark Hellabrunn zoo on December 11, 2013 in Munich, Germany. The two cubs, who have yet to be named, were born on December 9 to Giovanna and father Yoghi. (Photo by Lennart PreissGetty Images)
Screenshot of a video from December 9, 2013 released by the Muenchener Tierpark Hellabrunn zoo shows two new born polar bears cuddling with their mother Giovanna at the Muenchener Tierpark Hellabrunn zoo on December 11, 2013 in Munich, Germany. The two cubs, who have yet to be named, were born on December 9 to Giovanna and father Yoghi. (Photo by Lennart Preiss/Getty Images)
Screenshot of a video from December 9, 2013 released by the Muenchener Tierpark Hellabrunn zoo shows two new born polar bears cuddling with their mother Giovanna at the Muenchener Tierpark Hellabrunn zoo on December 11, 2013 in Munich, Germany. The two cubs, who have yet to be named, were born on December 9 to Giovanna and father Yoghi. (Photo by Lennart PreissGetty Images)
Screenshot of a video from December 9, 2013 released by the Muenchener Tierpark Hellabrunn zoo shows two new born polar bears cuddling with their mother Giovanna at the Muenchener Tierpark Hellabrunn zoo on December 11, 2013 in Munich, Germany. The two cubs, who have yet to be named, were born on December 9 to Giovanna and father Yoghi. (Photo by Lennart Preiss/Getty Images)
A six-month old female liliger cub Eva plays in snow in the Zoo in Novosibirsk, Russia, Thursday, Dec. 5, 2013. The cubs mother is Zita, a liger - half-lioness, half-tiger, and its father is a lion, Sam. (AP Photo Ilnar Salakhiev)
A six-month old female liliger cub Eva plays in snow in the Zoo in Novosibirsk, Russia, Thursday, Dec. 5, 2013. The cub's mother is Zita, a liger - half-lioness, half-tiger, and its father is a lion, Sam. (AP Photo /Ilnar Salakhiev)
A six-month old female liliger cub Eva plays in snow in a Zoo in Novosibirsk, Russia, Thursday, Dec. 5, 2013. The cubs mother is Zita, a liger - half-lioness, half-tiger, and its father is a lion, Sam. (AP Photo Ilnar Salakhiev)
A six-month old female liliger cub Eva plays in snow in a Zoo in Novosibirsk, Russia, Thursday, Dec. 5, 2013. The cub's mother is Zita, a liger - half-lioness, half-tiger, and its father is a lion, Sam. (AP Photo /Ilnar Salakhiev)
A six-month old female liliger cub Eva plays in the snow in a Zoo in Novosibirsk, Russia, Thursday, Dec. 5, 2013. The cubs mother is Zita, a liger - half-lioness, half-tiger, and its father is a lion, Sam. (AP Photo Ilnar Salakhiev)
A six-month old female liliger cub Eva plays in the snow in a Zoo in Novosibirsk, Russia, Thursday, Dec. 5, 2013. The cub's mother is Zita, a liger - half-lioness, half-tiger, and its father is a lion, Sam. (AP Photo /Ilnar Salakhiev)
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Six-month old female liliger cub Eva plays in snow with her mother Zita in the Zoo in Novosibirsk, Russia, Thursday, Dec. 5, 2013. The cubs mother is Zita, a liger - half-lioness, half-tiger, and its father is a lion, Sam. (AP Photo Ilnar Salakhiev)
Six-month old female liliger cub Eva plays in snow with her mother Zita in the Zoo in Novosibirsk, Russia, Thursday, Dec. 5, 2013. The cub's mother is Zita, a liger - half-lioness, half-tiger, and its father is a lion, Sam. (AP Photo /Ilnar Salakhiev)
A young boy pets a therapy dog named Toby inside Terminal 2 at San Francisco International Airport on December 3, 2013 in San Francisco, California. The San Francisco SPCA and San Francisco International Airport joined forces to launch a new program called Wag Brigade that will have a team of certified therapy dogs that will patrol the airports to help calm stressed travelers during the busy holiday travel season. (Photo by Justin SullivanGetty Images)
A young boy pets a therapy dog named Toby inside Terminal 2 at San Francisco International Airport on December 3, 2013 in San Francisco, California. The San Francisco SPCA and San Francisco International Airport joined forces to launch a new program called 'Wag Brigade' that will have a team of certified therapy dogs that will patrol the airport's to help calm stressed travelers during the busy holiday travel season. (Photo by Justin Sullivan/Getty Images)
A traveler pets a therapy dog named Lady Jenna Barbara inside Terminal 2 at San Francisco International Airport on December 3, 2013 in San Francisco, California. The San Francisco SPCA and San Francisco International Airport joined forces to launch a new program called Wag Brigade that will have a team of certified therapy dogs that will patrol the airports to help calm stressed travelers during the busy holiday travel season. (Photo by Justin SullivanGetty Images)
A traveler pets a therapy dog named Lady Jenna Barbara inside Terminal 2 at San Francisco International Airport on December 3, 2013 in San Francisco, California. The San Francisco SPCA and San Francisco International Airport joined forces to launch a new program called 'Wag Brigade' that will have a team of certified therapy dogs that will patrol the airport's to help calm stressed travelers during the busy holiday travel season. (Photo by Justin Sullivan/Getty Images)
A young girl pets a therapy dog named Donner inside Terminal 2 at San Francisco International Airport on December 3, 2013 in San Francisco, California. The San Francisco SPCA and San Francisco International Airport joined forces to launch a new program called Wag Brigade that will have a team of certified therapy dogs that will patrol the airports to help calm stressed travelers during the busy holiday travel season. (Photo by Justin SullivanGetty Images)
A young girl pets a therapy dog named Donner inside Terminal 2 at San Francisco International Airport on December 3, 2013 in San Francisco, California. The San Francisco SPCA and San Francisco International Airport joined forces to launch a new program called 'Wag Brigade' that will have a team of certified therapy dogs that will patrol the airport's to help calm stressed travelers during the busy holiday travel season. (Photo by Justin Sullivan/Getty Images)
A traveler pets a therapy dog named Toby inside Terminal 2 at San Francisco International Airport on December 3, 2013 in San Francisco, California. The San Francisco SPCA and San Francisco International Airport joined forces to launch a new program called Wag Brigade that will have a team of certified therapy dogs that will patrol the airports to help calm stressed travelers during the busy holiday travel season. (Photo by Justin SullivanGetty Images)
A traveler pets a therapy dog named Toby inside Terminal 2 at San Francisco International Airport on December 3, 2013 in San Francisco, California. The San Francisco SPCA and San Francisco International Airport joined forces to launch a new program called 'Wag Brigade' that will have a team of certified therapy dogs that will patrol the airport's to help calm stressed travelers during the busy holiday travel season. (Photo by Justin Sullivan/Getty Images)
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In this photo taken Wednesday, Nov. 27, 2013, one of the two lion cub runs around with parents, Nati and Zevs, at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013, one of the two lion cub runs around with parents, Nati and Zevs, at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo /Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013, lion Zevs plays with one of his two cubs at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013, lion Zevs plays with one of his two cubs at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo /Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013, lion Nati plays with her two cubs at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013, lion Nati plays with her two cubs at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo /Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013 two lion cubs play as they run around with their parents, Nati and Zevs, at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013 two lion cubs play as they run around with their parents, Nati and Zevs, at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo /Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013 two lion cubs play as they run around with their parents, Nati and Zevs, at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo Ilnar Salakhiev)
In this photo taken Wednesday, Nov. 27, 2013 two lion cubs play as they run around with their parents, Nati and Zevs, at the Zoo in Novosibirsk, Russia. The cubs were born on Oct. 30 but they were allowed to be photographed only on Wednesday. (AP Photo /Ilnar Salakhiev)
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Minnesota Gov. Mark Dayton, center, kicks off Thanksgiving week in Minnesota by ordering a brief stay of execution for a turkey at the state Capitol in Minneapolis, Monday, Nov. 25, 2013. The turkey will be sent to the St. Paul Salvation Army and, eventually, be served to the less-fortunate. This turkey is the brother of two turkeys that were sent to The White House for a presidential pardon. (AP PhotoThe Star Tribune, Glen Stubbe)
Minnesota Gov. Mark Dayton, center, kicks off Thanksgiving week in Minnesota by ordering a brief stay of execution for a turkey at the state Capitol in Minneapolis, Monday, Nov. 25, 2013. The turkey will be sent to the St. Paul Salvation Army and, eventually, be served to the less-fortunate. This turkey is the brother of two turkeys that were sent to The White House for a presidential pardon. (AP Photo/The Star Tribune, Glen Stubbe)
A visitor looks after a kitten at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu SayogaGetty Images)
A visitor looks after a kitten at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu Sayoga/Getty Images)
Staff workers gives milk to malnourished kitten at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu SayogaGetty Images)
Staff workers gives milk to malnourished kitten at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu Sayoga/Getty Images)
A staff worker feeds cats at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu SayogaGetty Images)
A staff worker feeds cats at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu Sayoga/Getty Images)
A veterinarian and staff worker prepares for sterilisation at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu SayogaGetty Images)
A veterinarian and staff worker prepares for sterilisation at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu Sayoga/Getty Images)
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A sick kitten cuddles with a visitor at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu SayogaGetty Images)
A sick kitten cuddles with a visitor at Villa Kitty on November 26, 2013 in Ubud, Bali, Indonesia. Villa Kitty established on March 17, 2011 initiated by Australian living in Bali Elizabeth Henzell, to serve as shelter to abandoned kittens and cats in Bali. (Photo by Putu Sayoga/Getty Images)
Karis, an eleven week old lion cub, plays in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP PhotoPA, Andrew Milligan)
Karis, an eleven week old lion cub, plays in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP Photo/PA, Andrew Milligan)
Karis, an eleven week old lion cub, blends in perfectly as she plays in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP PhotoPA, Andrew Milligan)
Karis, an eleven week old lion cub, blends in perfectly as she plays in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP Photo/PA, Andrew Milligan)
Karis, an eleven week old lion cub, rests in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP PhotoPA, Andrew Milligan)
Karis, an eleven week old lion cub, rests in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP Photo/PA, Andrew Milligan)
Karis, an eleven week old lion cub, plays in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP PhotoPA, Andrew Milligan)
Karis, an eleven week old lion cub, plays in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP Photo/PA, Andrew Milligan)
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Karis, an eleven week old lion cub, plays in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP PhotoPA, Andrew Milligan)
Karis, an eleven week old lion cub, plays in fallen leaves brushed up by keepers in her enclosure at Blair Drummond Safari Park, near Stirling, central Scotland, Wednesday Nov. 20, 2013. (AP Photo/PA, Andrew Milligan)
A white-handed gibbon, yet to be named, clings to his mother 24-year-old Phoenice, Thursday, Nov. 21, 2013, at the Philadelphia Zoo in Philadelphia. The new arrival was born Nov. 2, 2013 and the species is considered endangered. (AP PhotoMatt Rourke)
A white-handed gibbon, yet to be named, clings to his mother 24-year-old Phoenice, Thursday, Nov. 21, 2013, at the Philadelphia Zoo in Philadelphia. The new arrival was born Nov. 2, 2013 and the species is considered endangered. (AP Photo/Matt Rourke)
A rehabilitated harbour seal pup equipped with satellite tag on its head is released into the waters of Howe Sound at Porteau Cove, B.C. by the Vancouver Aquarium, Wednesday, Nov. 20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquariums Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seals hair coat on the animals heads, and may last anywhere from a couple of weeks to a year. (AP PhotoThe Canadian Press, Jonathan Hayward)
A rehabilitated harbour seal pup equipped with satellite tag on its head is released into the waters of Howe Sound at Porteau Cove, B.C. by the Vancouver Aquarium, Wednesday, Nov. 20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquarium's Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seal's hair coat on the animals' heads, and may last anywhere from a couple of weeks to a year. (AP Photo/The Canadian Press, Jonathan Hayward)
Volunteers from the Vancouver Aquarium carry a rehabilitated harbour seal pup equipped with a satellite tag on its head toward the waters of Howe Sound at Porteau Cove, B.C. Wednesday, Nov.20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquariums Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seals hair coat on the animals heads, and may last anywhere from a couple of weeks to a year. (AP PhotoThe Canadian Press, Jonathan Hayward)
Volunteers from the Vancouver Aquarium carry a rehabilitated harbour seal pup equipped with a satellite tag on its head toward the waters of Howe Sound at Porteau Cove, B.C. Wednesday, Nov.20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquarium's Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seal's hair coat on the animals' heads, and may last anywhere from a couple of weeks to a year. (AP Photo/The Canadian Press, Jonathan Hayward)
Rehabilitated harbour seal pups equipped with satellite tags on their heads are released into the waters of Howe Sound at Porteau Cove, B.C. by the Vancouver Aquarium, Wednesday, Nov. 20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquariums Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seals hair coat on the animals heads, and may last anywhere from a couple of weeks to a year. (AP PhotoThe Canadian Press, Jonathan Hayward)
Rehabilitated harbour seal pups equipped with satellite tags on their heads are released into the waters of Howe Sound at Porteau Cove, B.C. by the Vancouver Aquarium, Wednesday, Nov. 20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquarium's Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seal's hair coat on the animals' heads, and may last anywhere from a couple of weeks to a year. (AP Photo/The Canadian Press, Jonathan Hayward)
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Rehabilitated harbour seal pups equipped with satellite tags on their heads are released into the waters of Howe Sound at Porteau Cove, B.C. by the Vancouver Aquarium, Wednesday, Nov. 20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquariums Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seals hair coat on the animals heads, and may last anywhere from a couple of weeks to a year. (AP PhotoThe Canadian Press, Jonathan Hayward)
Rehabilitated harbour seal pups equipped with satellite tags on their heads are released into the waters of Howe Sound at Porteau Cove, B.C. by the Vancouver Aquarium, Wednesday, Nov. 20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquarium's Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seal's hair coat on the animals' heads, and may last anywhere from a couple of weeks to a year. (AP Photo/The Canadian Press, Jonathan Hayward)
Rehabilitated harbour seal pups equipped with satellite tags on their heads are released into the waters of Howe Sound at Porteau Cove, B.C. by the Vancouver Aquarium, Wednesday, Nov. 20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquariums Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seals hair coat on the animals heads, and may last anywhere from a couple of weeks to a year. (AP PhotoThe Canadian Press, Jonathan Hayward)
Rehabilitated harbour seal pups equipped with satellite tags on their heads are released into the waters of Howe Sound at Porteau Cove, B.C. by the Vancouver Aquarium, Wednesday, Nov. 20, 2013. Five of the seven pups released pups have been equipped with satellite transmitters that will provide the aquarium's Marine Mammal Rescue Centre with information about where the seals go and how they do after returning to the wild. The satellite-linked tags are glued to the seal's hair coat on the animals' heads, and may last anywhere from a couple of weeks to a year. (AP Photo/The Canadian Press, Jonathan Hayward)
African lion cubs, Fajer, right, and his sister, Sejeel, left, rest after feeding at Besan Zoo in Beit Lahiya, northern Gaza Strip, Tuesday, Nov. 19, 2013. For the first time in the Gaza Strip, a lion has given birth to two cubs, on Sunday evening. The 6 year-old African lion, which was smuggled through the tunnels four years ago, gave birth in normal conditions according to the northern Gaza Besan Zoo. The manger has named the male cub Fajer in reference to the Iranian made Fajer rockets which were used during 8 days of fighting between Gaza militants and Israel in 2012, and the female Sejeel, the name which Hamas called their offensive.(AP PhotoHatem Moussa)
African lion cubs, Fajer, right, and his sister, Sejeel, left, rest after feeding at Besan Zoo in Beit Lahiya, northern Gaza Strip, Tuesday, Nov. 19, 2013. For the first time in the Gaza Strip, a lion has given birth to two cubs, on Sunday evening. The 6 year-old African lion, which was smuggled through the tunnels four years ago, gave birth in normal conditions according to the northern Gaza Besan Zoo. The manger has named the male cub Fajer in reference to the Iranian made Fajer rockets which were used during 8 days of fighting between Gaza militants and Israel in 2012, and the female Sejeel, the name which Hamas called their offensive.(AP Photo/Hatem Moussa)
Two Sumatran tiger cubs, a male, Bandar and a female, Sukacita, play on a set of stairs as they make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The two cubs were born in August and are now on public view. (AP PhotoJacquelyn Martin)
Two Sumatran tiger cubs, a male, Bandar and a female, Sukacita, play on a set of stairs as they make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The two cubs were born in August and are now on public view. (AP Photo/Jacquelyn Martin)
Mother Sumatran tiger Damai nuzzles one of her two cubs as the Sumatran tiger cubs make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The cubs, who were born in August, are now on public view. (AP PhotoJacquelyn Martin)
Mother Sumatran tiger Damai nuzzles one of her two cubs as the Sumatran tiger cubs make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The cubs, who were born in August, are now on public view. (AP Photo/Jacquelyn Martin)
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Damai, a Sumatran tiger, plays with one of her two cubs as the cubs make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The cubs, who were born in August, are now on public view. (AP PhotoJacquelyn Martin)
Damai, a Sumatran tiger, plays with one of her two cubs as the cubs make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The cubs, who were born in August, are now on public view. (AP Photo/Jacquelyn Martin)
Two Sumatran tiger cubs, Bandar and Sukacita, play as they make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The two cubs were born in August and are now on public view. (AP PhotoJacquelyn Martin)
Two Sumatran tiger cubs, Bandar and Sukacita, play as they make their public debut at the National Zoo in Washington, Monday Nov. 18, 2013. The two cubs were born in August and are now on public view. (AP Photo/Jacquelyn Martin)
Kodee, an almost 1-month-old baby hamadryas baboon, plays with a toy in the Baboon Cliffs Exhibit at the Oakland Zoo in Oakland, Calif., on Thursday, Nov. 14, 2013. Kodee was born on Oct. 24, and is doing well acclimating to her new environment. Her parents Martijn, 12, and Krista, 16, were relocated to Oakland from the Emmen Zoo in the Netherlands, in the hopes of increasing the genetic diversity of captive baboons in the United States. (AP PhotoThe Tribune, Jane Tyska)
Kodee, an almost 1-month-old baby hamadryas baboon, plays with a toy in the Baboon Cliffs Exhibit at the Oakland Zoo in Oakland, Calif., on Thursday, Nov. 14, 2013. Kodee was born on Oct. 24, and is doing well acclimating to her new environment. Her parents Martijn, 12, and Krista, 16, were relocated to Oakland from the Emmen Zoo in the Netherlands, in the hopes of increasing the genetic diversity of captive baboons in the United States. (AP Photo/The Tribune, Jane Tyska)
Kodee, an almost 1-month-old baby hamadryas baboon, stays close to her mother Krista in their Baboon Cliffs Exhibit at the Oakland Zoo in Oakland, Calif., on Thursday, Nov. 14, 2013. Kodee was born on Oct. 24, and is doing well acclimating to her new environment. Her parents Martijn, 12, and Krista, 16, were relocated to Oakland from the Emmen Zoo in the Netherlands, in the hopes of increasing the genetic diversity of captive baboons in the United States. (AP PhotoThe Tribune, Jane Tyska)
Kodee, an almost 1-month-old baby hamadryas baboon, stays close to her mother Krista in their Baboon Cliffs Exhibit at the Oakland Zoo in Oakland, Calif., on Thursday, Nov. 14, 2013. Kodee was born on Oct. 24, and is doing well acclimating to her new environment. Her parents Martijn, 12, and Krista, 16, were relocated to Oakland from the Emmen Zoo in the Netherlands, in the hopes of increasing the genetic diversity of captive baboons in the United States. (AP Photo/The Tribune, Jane Tyska)
Kodee, an almost 1-month-old baby hamadryas baboon, stays close to her mother Krista in their Baboon Cliffs Exhibit at the Oakland Zoo in Oakland, Calif., on Thursday, Nov. 14, 2013. Kodee was born on Oct. 24, and is doing well acclimating to her new environment. Her parents Martijn, 12, and Krista, 16, were relocated to Oakland from the Emmen Zoo in the Netherlands, in the hopes of increasing the genetic diversity of captive baboons in the United States. (AP PhotoThe Tribune, Jane Tyska)
Kodee, an almost 1-month-old baby hamadryas baboon, stays close to her mother Krista in their Baboon Cliffs Exhibit at the Oakland Zoo in Oakland, Calif., on Thursday, Nov. 14, 2013. Kodee was born on Oct. 24, and is doing well acclimating to her new environment. Her parents Martijn, 12, and Krista, 16, were relocated to Oakland from the Emmen Zoo in the Netherlands, in the hopes of increasing the genetic diversity of captive baboons in the United States. (AP Photo/The Tribune, Jane Tyska)
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Gorilla Baby Sawa sits in the arms of its mother in the zoo in Frankfurt, Germany, Wednesday, Nov.13, 2013. (AP PhotoMichael Probst)
Gorilla Baby Sawa sits in the arms of its mother in the zoo in Frankfurt, Germany, Wednesday, Nov.13, 2013. (AP Photo/Michael Probst)
Five days old Grevys zebra Heinrich stands in front of his mother Kianga in the enclosure at the Tierpak zoo, in Berlin, Tuesday, Nov. 12, 2013. (AP PhotoMarkus Schreiber)
Five days old Grevy's zebra Heinrich stands in front of his mother Kianga in the enclosure at the Tierpak zoo, in Berlin, Tuesday, Nov. 12, 2013. (AP Photo/Markus Schreiber)
A two-month old male baby giant panda, born in captivity at Madrid zoo lies on top of a bed in Madrid, Spain Friday Nov. 8, 2013. The baby panda, born last Aug. 30, 2013, weighing 210 grams and now weighing 4.66 kilos will be named on Dec. 5 pending results of an internet poll. (AP PhotoPaul White)
A two-month old male baby giant panda, born in captivity at Madrid zoo lies on top of a bed in Madrid, Spain Friday Nov. 8, 2013. The baby panda, born last Aug. 30, 2013, weighing 210 grams and now weighing 4.66 kilos will be named on Dec. 5 pending results of an internet poll. (AP Photo/Paul White)
A 2-month-old male baby giant panda, born in captivity at Madrid zoo, is placed in a bed by giant panda breeding specialist Chen Xin in Madrid, Spain Friday Nov. 8, 2013. The baby panda, born last Aug. 30, 2013, weighing 210 grams and now weighing 4.66 kilos will be named on Dec. 5 pending results of an Internet poll. (AP PhotoPaul White)
A 2-month-old male baby giant panda, born in captivity at Madrid zoo, is placed in a bed by giant panda breeding specialist Chen Xin in Madrid, Spain Friday Nov. 8, 2013. The baby panda, born last Aug. 30, 2013, weighing 210 grams and now weighing 4.66 kilos will be named on Dec. 5 pending results of an Internet poll. (AP Photo/Paul White)
Two male Barbary lion cubs Terry, left, and Basty, right, are pictured for the first time in their free run at the zoo in Olomouc, Czech Republic, Thursday, Nov. 7, 2013. The cubs were born on Aug. 11. 2013. At the Olomouc zoo 19 cubs were born since 1995. It is the only one in the Czech Republic where these lions breed. (AP Photos, CTKLudek Perina)
Two male Barbary lion cubs Terry, left, and Basty, right, are pictured for the first time in their free run at the zoo in Olomouc, Czech Republic, Thursday, Nov. 7, 2013. The cubs were born on Aug. 11. 2013. At the Olomouc zoo 19 cubs were born since 1995. It is the only one in the Czech Republic where these lions breed. (AP Photos, CTK/Ludek Perina)
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A snowy owl sits in its compound at the zoological garden during low temperatures in Hof, southern Germany, Tuesday, Nov. 5, 2014. (AP Photodpa, David Ebener)
A snowy owl sits in its compound at the zoological garden during low temperatures in Hof, southern Germany, Tuesday, Nov. 5, 2014. (AP Photo/dpa, David Ebener)
New Yorks Central Park Zoo is showing off two baby snow leopard cubs born there this summer. This Oct. 30, 2013, photo provided by the Wildlife Conservation Society shows the two at the zoo. (AP PhotoWildlife Conservation Society)
New York's Central Park Zoo is showing off two baby snow leopard cubs born there this summer. This Oct. 30, 2013, photo provided by the Wildlife Conservation Society shows the two at the zoo. (AP Photo/Wildlife Conservation Society)
Two female red panda cubs make their public debut following the recent bad weather in their enclosure at Port Lympne Wild Animal Park near Ashford, Kent, England, Friday, Nov. 1, 2013. (AP PhotoGareth Fuller, PA Wire)
Two female red panda cubs make their public debut following the recent bad weather in their enclosure at Port Lympne Wild Animal Park near Ashford, Kent, England, Friday, Nov. 1, 2013. (AP Photo/Gareth Fuller, PA Wire)
Karis, an 8 week old lion cub, growls at a pumpkin as she explores a Halloween treat put in her enclosure by staff at Blair Drummond Safari Park near Stirling, Scotland, Tuesday, Oct. 29, 2013. (AP PhotoAndrew Milligan, PA Wire)
Karis, an 8 week old lion cub, growls at a pumpkin as she explores a Halloween treat put in her enclosure by staff at Blair Drummond Safari Park near Stirling, Scotland, Tuesday, Oct. 29, 2013. (AP Photo/Andrew Milligan, PA Wire)
A silverback gorilla appears to be smiling as he eats a Halloween treat during an enrichment program at the Oklahoma City Zoo in Oklahoma City Friday, Oct. 25, 2013. (AP PhotoSue Ogrocki)
A silverback gorilla appears to be smiling as he eats a Halloween treat during an enrichment program at the Oklahoma City Zoo in Oklahoma City Friday, Oct. 25, 2013. (AP Photo/Sue Ogrocki)
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A baby male chimpanzee is carried by his mother Kuma at Taronga Zoo on October 25, 2013 in Sydney, Australia. The baby Chimpanzee was born to mother Kuma in the Zoos chimpanzee sanctuary last week. (Photo by Cameron SpencerGetty Images)
A baby male chimpanzee is carried by his mother 'Kuma' at Taronga Zoo on October 25, 2013 in Sydney, Australia. The baby Chimpanzee was born to mother Kuma in the Zoo's chimpanzee sanctuary last week. (Photo by Cameron Spencer/Getty Images)
A baby male chimpanzee is nursed by his mother Kuma (L) at Taronga Zoo on October 25, 2013 in Sydney, Australia. The baby Chimpanzee was born to mother Kuma in the Zoos chimpanzee sanctuary last week. (Photo by Cameron SpencerGetty Images)
A baby male chimpanzee is nursed by his mother 'Kuma' (L) at Taronga Zoo on October 25, 2013 in Sydney, Australia. The baby Chimpanzee was born to mother Kuma in the Zoo's chimpanzee sanctuary last week. (Photo by Cameron Spencer/Getty Images)
A baby male chimpanzee is carried by his mother Kuma at Taronga Zoo on October 25, 2013 in Sydney, Australia. The baby Chimpanzee was born to mother Kuma in the Zoos chimpanzee sanctuary last week. (Photo by Cameron SpencerGetty Images)
A baby male chimpanzee is carried by his mother 'Kuma' at Taronga Zoo on October 25, 2013 in Sydney, Australia. The baby Chimpanzee was born to mother Kuma in the Zoo's chimpanzee sanctuary last week. (Photo by Cameron Spencer/Getty Images)
A baby male chimpanzee is carried by his mother Kuma at Taronga Zoo on October 25, 2013 in Sydney, Australia. The baby Chimpanzee was born to mother Kuma in the Zoos chimpanzee sanctuary last week. (Photo by Cameron SpencerGetty Images)
A baby male chimpanzee is carried by his mother 'Kuma' at Taronga Zoo on October 25, 2013 in Sydney, Australia. The baby Chimpanzee was born to mother Kuma in the Zoo's chimpanzee sanctuary last week. (Photo by Cameron Spencer/Getty Images)
A newborn baby zebra named Seka, right standing by its mother at the Belgrade Zoo, Serbia, on Thursday, Oct. 24, 2013. Seka, a female, was born on Wednesday and is doing well. (AP PhotoDarko Vojinovic)
A newborn baby zebra named Seka, right standing by its mother at the Belgrade Zoo, Serbia, on Thursday, Oct. 24, 2013. Seka, a female, was born on Wednesday and is doing well. (AP Photo/Darko Vojinovic)
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A Siamese cat looks out a window decorated for Halloween in a home in Lawrence, Kan., Monday, Oct. 21, 2013. (AP PhotoOrlin Wagner)
A Siamese cat looks out a window decorated for Halloween in a home in Lawrence, Kan., Monday, Oct. 21, 2013. (AP Photo/Orlin Wagner)
A flock of cranes flies past the rising moon in Nauen near Berlin, Germany, Friday, Oct. 18, 2013. The cranes rest in the wetlands west of Berlin on their way from breeding places in the north to their wintering grounds in the south. (AP PhotoFerdinand Ostrop)
A flock of cranes flies past the rising moon in Nauen near Berlin, Germany, Friday, Oct. 18, 2013. The cranes rest in the wetlands west of Berlin on their way from breeding places in the north to their wintering grounds in the south. (AP Photo/Ferdinand Ostrop)
A baboon yawns on a cold and rainy day at the zoo in Krefeld, Germany, Thursday, Oct. 17, 2013. (AP PhotoMartin Meissner)
A baboon yawns on a cold and rainy day at the zoo in Krefeld, Germany, Thursday, Oct. 17, 2013. (AP Photo/Martin Meissner)
A black rhinoceros licks its cub Nabila at the zoo in Krefeld, Germany, Thursday, Oct. 17, 2013. (AP PhotoMartin Meissner)
A black rhinoceros licks its cub Nabila at the zoo in Krefeld, Germany, Thursday, Oct. 17, 2013. (AP Photo/Martin Meissner)
A rooster gazes at a llama in its stall on a rainy day at the zoo in Krefeld, Germany, Thursday, Oct. 17, 2013. (AP PhotoMartin Meissner)
A rooster gazes at a llama in its stall on a rainy day at the zoo in Krefeld, Germany, Thursday, Oct. 17, 2013. (AP Photo/Martin Meissner)
Photos That Never Made It

Photos That Never Made It

For every photo featured in National Geographic, thousands were rejected.
History of Banned Books

History of Banned Books

Take a look back at banned books that became literary classics.
Local Holiday Markets

Local Holiday Markets

Avoid the crowds and get through your list at these markets, a few of the...
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New Zoo Additions

Check out the growing red panda cubs born at the Smithsonian.
Click on the image above to see it at its original size.

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