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A view of a puppy at the North Shore Animal League America's Tour For Life Pet Adoption Event on April 26, 2012 in New York. (Photo by Cindy Ord/Getty Images)
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Twin two-month-old Red Panda cubs "Tenzin" (R) and "Jishnu" make their debut at Taronga Zoo March 28, 2007 in Sydney, Australia. The cubs are a result of the international breeding program for the endangered species. (Photo by Ian Waldie/Getty Images)
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Tasmanian Devil joeys are seen at Taronga Zoo on October 22, 2009 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images) -
A cheetah keeper prepares to catch a cheetah cub as it climbs out on to a limb as two cubs make their public debut at the Smithsonian National Zoo on July 24, 2012 in Washington, DC.(Photo by T.J. Kirkpatrick/Getty Images) -
Sumatran Tiger cubs tear apart a wrapped Christmas present at Taronga Zoo on December 21, 2011 in Sydney, Australia. (Photo by Brendon Thorne/Getty Images) -
Giant Panda cubs are seen on show at China's largest breeding Programme at Chengdu Research Base Of Giant Panda Breeding on September 19, 2007 in Chengdu, China. (Photo by Paul Gilham/Getty Images) -
A Dartmoor Hill pony foal walks with its mother on the moor on Dartmoor on May 17, 2011 in Princetown England. (Photo by Matt Cardy/Getty Images) -
Recently hatched cygnets swim with their mother at Abbotsbury Swannery - the only publically accessible colony of nesting mute swans in the world - on May 11, 2012 near Weymouth, England. (Photo by Matt Cardy/Getty Images) -
Lion cubs play on the banks of the Makhutswi River at sunrise on July 21, 2010 in the Edeni Game Reserve, South Africa. (Photo by Cameron Spencer/Getty Images) -
A zookeeper holds up Kit and Kitty, the twin red pandas born in June on the first day of their introduction into their new enclosure at Tierpark Zoo on September 13, 2011 in Berlin, Germany. (Photo by Sean Gallup/Getty Images) -
A pair of newborn Siberian tigers and a two puppies nurse from a golden retriever at the Changchun Zoo in Changchun of Jilin Province, China. The dog has become the surrogate mother for the tigers.(Photo by China Photos/Getty Images) -
Newborn baby panthers Larisa and Sipura stare at photographers during a media presentation of the cubs at the Tierpark zoo on June 9, 2009 in Berlin, Germany. (Photo by Sean Gallup/Getty Images) -
A Roe Deer and her fawn shelter on the side of the course during the 2012 Scottish Hydro Challenge - Day Four at The Macdonald Spey Valley Golf Course on June 24, 2012 in Aviemore, Scotland. (Photo by Ian MacNicol/Getty Images) -
Twin giant panda cubs check out their surroundings at the Bifengxia base of China Giant Panda Protection and Research Center on October 24, 2008 in Yaan of Sichuan Province, China. (Photo by China Photos/Getty Images) -
A three month-old baby gorilla named Hasani sits in the grass March 11, 2009 at the San Francisco Zoo in San Francisco, California. (Photo by Justin Sullivan/Getty Images) -
Newborn lambs are watched by their mother at Barracks Farm on April 1, 2011 in Fetcham, England. (Photo by Peter Macdiarmid/Getty Images) -
A 3-day old chihuahua puppy with heart-shaped markings is presented to the media at Pucchin Dog's on August 6, 2009 in Odate, Akita prefecture, Japan. (Photo by Pucchin Dog's via Getty Images) -
A baby hippopotamus stands next to its mother on the first day it was presented to the public at the Zoo Berlin zoo on November 1, 2011 in Berlin, Germany. The baby hippo was born at the zoo on October 23. (Photo by Sean Gallup/Getty Images) -
Kittens are seen in a bucket before they meet Camilla, Duchess of Cornwall's as she visits Battersea Dog and Cat's Home on October 27, 2010 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images) -
Hasani (R), a six month-old Western Lowland Gorilla, sits with his surrogate mother Bawang in a gorilla exhibit during his first public viewing at the San Francisco Zoo June 5, 2009 in San Francisco, California. (Photo by Justin Sullivan/Getty Images) -
A worker takes care of a newly-born panda cub delivered by panda Guoguo at the 'Bifengxia Giant Panda Base' and Research' on July 7, 2008 in Yaan, China. (Photo by China Photos/Getty Images) -
Six-month-old polar bear cub "Knut" plays with minder Marcus Roebke at the Berlin Zoo on June 22, 2007 in Berlin, Germany. Knut later died. (Photo by Sean Gallup/Getty Images) -
Jule, a baby Rothschild giraffe, stands next to her mother in her enclosure at Tierpark Berlin zoo on June 29, 2012 in Berlin, Germany. Jule was born at the zoo on June 10. (Photo by Sean Gallup/Getty Images) -
Two California sea lion pups, estimated to be less than one week old, are being bottled fed every two hours at SeaWorld San Diego. Lifeguards called SeaWorld's animal rescue team when they were spotted with their umbilical cords still attached. (Photo by Mike Aguilera/SeaWorld San Diego via Getty Images) -
Recently hatched cygnets swim with their mother at Abbotsbury Swannery - the only publically accessible colony of nesting mute swans in the world - on May 11, 2012 near Weymouth, England. (Photo by Matt Cardy/Getty Images) -
Budapest Zoo's new born southern white rhinoceros (Ceratotherium simum) calf tries to stand up after its birth on January 23, 2007 in Budapest, Hungary. (Photo by Bela Szandelszky-Pool/Getty Images) -
Kambiri, a baby pygmy hippo calf, explores her den at the Taronga Zoo on August 5, 2010 in Sydney, Australia. The hippo calf is the first to be reared by its mother at the Taronga Zoo in over 20 years. (Photo by Brendon Thorne/Getty Images) -
Three-month old cheetah cubs make their public debut at the Smithsonian National Zoo on July 24, 2012 in Washington, DC. (Photo by T.J. Kirkpatrick/Getty Images) -
One of 13 panda cubs born in 2008 at Chengdu Research Base of Giant Panda Breeding on January 21, 2009 in Chengdu of Sichuan Province, China. The base currently has 82 pandas in captivity, including the 13 panda cubs. (Photo by China Photos/Getty Images) -
Three baby meerkats cuddle in the cold at Bristol Zoo on April 4, 2008 in Bristol, England. (Photo by Matt Cardy/Getty Images) -
Giant panda cubs sleep in a breeding room at the Chengdu Research Base of Giant Panda Breeding on September 8, 2008 in Chengdu of Sichuan Province, China.(Photo by China Photos/Getty Images) -
Sophia, a twenty-seven-year-old Bornean orangutan, holds her newborn in her enclosure at Brookfield Zoo October 23, 2008 in Brookfield, Illinois. (Photo by Scott Olson/Getty Images) -
Six-week-old tiger cubs are displayed June 12, 2008 in Las Vegas, Nevada. The cubs took up residence at Siegfried & Roy's Secret Garden and Dolphin Habitat at the Mirage Hotel & Casino. (Photo by Ethan Miller/Getty Images) -
Muti, an 11-day-old female orangutan baby plays with keeper Sri Suwarni in a nursery at the Taman Safari conservation center on August 18, 2007 in Cisarua, Indonesia. Taman Safari plays an important role in breeding rare and endangered animals. (Photo by: Dimas Ardian/Getty Images) -
Lambs only a few days old occupy a pen at the Educational and Reserach Station for Animal Breeding in Brandenburg state on January 27, 2012 in Gross Kreutz, Germany. (Photo by Sean Gallup/Getty Images) -
A mounted lion cub on display in the specimen pavilion on April 15th, 2012 in Beijing, China.(Photo by Lintao Zhang/Getty Images) -
A newly born panda bear sleeps in it's incubator at the Madrid Zoo on October 7, 2010 in Madrid, Spain. (Photo by Jasper Juinen/Getty Images) -
Adult gentoo penguins keep an eye on their newly born chick at Edinburgh Zoo on June 10, 2011 in Edinburgh, Scotland. (Photo by Jeff J Mitchell/Getty Images) -
One of two rare white lion cubs from Mogo Zoo on New South Wales South Coast plays with a toy at a photo call at Lavender Green, Luna Park on November 23, 2006 in Sydney, Australia. (Photo by Matt King/Getty Images) -
One of Edinburgh Zoo's short clawed otter pups ventures out in their enclosure on October 3, 2012 in Edinburgh,Scotland. (Photo by Jeff J Mitchell/Getty Images) -
Joeys rescued after bushfires are seen at the home of carer Annie Williams on April 23, 2009 in Gisborne, Australia. (Photo by Robert Cianflone/Getty Images) -
Jule, a baby Rothschild giraffe, runs in her enclosure at Tierpark Berlin zoo on June 29, 2012 in Berlin, Germany. Jule was born at the zoo on June 10. (Photo by Sean Gallup/Getty Images) -
A baby Asian elephant, born only two days before, seeks his mother's breast in his enclosure at Tierpark Berlin zoo on May 10, 2012 in Berlin, Germany. (Photo by Sean Gallup/Getty Images) -
A chihuahua puppy poses at Pucchin Dog's shop on July 11, 2007 in Akita prefecture, Japan. The chihuahua was born with a perfect heart-shaped marking on his back. Shop owner Emiko Sakurada has no plans to sell the puppy, which has been named "Heart-kun". (Photo by Koichi Kamoshida/Getty Images) -
A baby Fennec is seen at Sunshine International Aquarium on June 24, 2009 in Tokyo, Japan. The small nocturnal fox babies were born on May 17. (Photo by Junko Kimura/Getty Images) -
The polar bear cub sits in his basket in a handout picture offered by the Zoo Stuttgart Wilhelma on February 28, 2008 in Stuttgart, Germany. (Photo by Zoo Stuttgart Wilhelma via Getty Images) -
A Sumantran tiger cub seen on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images) -
Twin baby panthers Remaong and Ferra emerge from their basket while being presented to the media at Tierpark Berlin zoo on July 13, 2012 in Berlin, Germany. The two panthers were born in captivity on April 26. (Photo by Sean Gallup/Getty Images) -
A recently rescued grey seal pup looks up from its indoor kennel at the RSPCA West Hatch Wildlife Centre on January 9, 2012 in Taunton, England. (Photo by Matt Cardy/Getty Images) -
Nekama, a baby North Chinese leopard, emerges from a basket at her official presentation to the media at Tierpark zoo on March 15, 2011 in Berlin, Germany. (Photo by Sean Gallup/Getty Images) -
Baby Fennecs are seen at Sunshine International Aquarium on June 24, 2009 in Tokyo, Japan. The small nocturnal fox babies were born on May 17. (Photo by Junko Kimura/Getty Images) -
A seven week old Daschund cross puppy waits to be re-homed at the Cheshire Dogs Home on January 4, 2010 in Warrington, England. (Photo by Christopher Furlong/Getty Images) -
A newly born panda bear sleeps in it's incubator at the Madrid Zoo on October 7, 2010 in Madrid, Spain. (Photo by Jasper Juinen/Getty Images) -
Ducklings slide down a ramp int he animal nursery during the 2012 Sydney Royal Easter Show at the Sydney Showground on April 6, 2012 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images) -
A seven month-old Northern Koala joey clings to his mother Tara after emerging from her pouch at Sydney Wildlife World July 31, 2007 in Sydney, Australia. (Photo by Ian Waldie/Getty Images) -
Knut, the baby polar bear born in Berlin Zoo, plays with his minder Thomas Doerflein in his compound at the zoo April 12, 2007 in Berlin, Germany. (Photo by Sean Gallup/Getty Images) -
The baby Asian elephant Anchali stands in the elephant house next to her mother Pang Pha on August 15, 2012 in the Berlin Zoo in Berlin, Germany. (Photo by Adam Berry/Getty Images) -
Wilbaer, the four-month old polar bear cub is seen playing during the first day of his public appearance at the Wilhemina on April 16, 2008 in Stuttgart, (Photo by Thomas Niedermueller/Getty Images) -
Red and white collie puppy sheepdogs. (Photo by Christopher Furlong/Getty Images) -
A Dartmoor Hill pony foal runs with its mother on the moor on Dartmoor on May 17, 2011 in Princetown England. (Photo by Matt Cardy/Getty Images) -
A baby hippopotamus dives while accompanying her mother on the first day of her presentation to the public at the Berlin Zoo on December 16, 2008 in Berlin, Germany. (Photo by Sean Gallup/Getty Images) -
Piglets suck milk from their mother at the Ebsen organic farm on January 13, 2011 in Langenhorn, Germany. (Photo by Joern Pollex/Getty Images) -
Twin baby panthers Remaong and Ferra cling to their basket while being presented to the media at Tierpark Berlin zoo on July 13, 2012 in Berlin, Germany. (Photo by Sean Gallup/Getty Images) -
A giant panda cub is seen in an incubator at the Chengdu Research Base of Giant Panda Breeding on September 8, 2008 in Chengdu of Sichuan Province, China. (Photo by China Photos/Getty Images) -
Siberian tiger cubs are seen at the Hengdaohezi Breeding Center for Felidae on October 26, 2007 in Harbin of Heilongjiang Province, China. (Photo by China Photos/Getty Images) -
(L-R) Brooklyn's Deli, a black Labrador Retriever pup, Ziva, a German Shepherd pup and Jag, a Beagle pup attend as American Kennel Club announces Most Popular Dogs in the U.S. at American Kennel Club Offices on February 28, 2012 in New York City. (Photo by Gary Gershoff/Getty Images for AKC) -
A baby Asian elephant, born only two days before, gets used to his wobbly legs while exploring his enclosure at Tierpark Berlin zoo on May 10, 2012 in Berlin, Germany. (Photo by Sean Gallup/Getty Images) -
Flocke, the three-month old polar bear cub plays during her first public appearance at the Nuremberg Zoo on April 9, 2008 in Nuremberg, Germany. (Photo by Johannes Simon/Getty Images) -
Sumatran tiger Jumilah is seen with her cubs on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images) -
Joe Wasilewski releases a crocodile hatchling near the Florida Power & Light's Turkey Point Nuclear Power Plant where they protect the crocodile and conduct research by counting their nests annually to record population changes June 28, 2012 near Florida City, Florida. (Photo by Joe Raedle/Getty Images) -
A three-week-old chihuahua puppy named Tom Thumb poses in a tea cup on April 7, 2009 in Renton, Scotland. The pup, which measures eight inches long, is thought to be one of the smallest dogs born in the UK and is just two inches short of a world record. (Photo by Jeff J Mitchell/Getty Images)