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A baby rhesus macaque (Macaca mulatta) touches the face of a tiger cub as they play together at a zoo in Hefei, Anhui province, August 2, 2012. REUTERS/Stringer
A baby rhesus macaque (Macaca mulatta) plays with a tiger cub at a zoo in Hefei, Anhui province, August 2, 2012. REUTERS/Stringer
A baby rhesus macaque (Macaca mulatta) looks up as it plays with a tiger cub at a zoo in Hefei, Anhui province, August 2, 2012. REUTERS/Stringer
Sarah, an 11-year-old cheetah at the Cincinnati Zoo, breaks her own world record by running 100m in 5.95 seconds in this National Geographic magazine picture taken at the zoo's Regional Cheetah Breeding Facility (Mast Farm) in Clermont County, Ohio June 20, 2012. Sarah was clocked at 61mph (101kph) and broke her previous record of 6.13 seconds which she set in 2009. REUTERS/00a9 Ken Geiger/National Geographic Magazine/Handout
A Red Panda Bear sleeps in the Panda Bear enclosure at the Beijing Zoo on May 22, 2012. The zoo grounds were originally a Ming Dynasty imperial palace and finally opened to the public in 1908. The zoo's history states that during the WWII, most of the zoo's animals died of starvation with only 13 monkeys and one old emu surviving the war.AFP PHOTO/Mark RALSTON
Rio's zoo veterinarian Alex Spadetti plays with 'Lequinho', a two-month-old 'green monkey' (Cercopithecus pygerythrus), a species originary from South Africa, in Rio de Janeiro, Brazil, on May 22. 2012. Lequinho, whose mother died upon giving birth, is being taken care of by a team of veterinarians and biologists TOPSHOTS/AFP PHOTO/VANDERLEI ALMEIDA
Siberian tiger cubs play at a private zoo in Abony, east of Budapest May 17, 2012. The cubs were born near Hamburg in Germany, but came to Hungary when they were only two and a half weeks old, after their mother became ill and could not feed them any more. They are six weeks old now and growing fast, fed on goats' milk and special tiger food. To match Reuters Life! HUNGARY-TIGERS/ Picture taken May 17, 2012. REUTERS/Stringer
'Lequinho', a two-month-old 'green monkey' (Cercopithecus pygerythrus), a species originary from South Africa, sits on a tripod in Rio de Janeiro, Brazil, on May 22. 2012. Lequinho, whose mother died upon giving birth, is being taken care of by a team of veterinarians and biologists AFP PHOTO/VANDERLEI ALMEIDA
A heron kills and eats a gosling in the Serpentine lake in Hyde Park on May 22, 2012 in London, England. Following a cool, overcast morning temperatures in the capital are expected to reach 26 degrees Celsius today with warm weather forecast for the rest of the week. (Photo by Oli Scarff/Getty Images)
In this handout image provided by Disney Parks, Kendi, a 13-year-old female white rhino, tends to her new male calf at Disney's Animal Kingdom at Walt Disney World May 7, 2012 in Lake Buena Vista, Florida. The yet-unnamed calf was born May 4 after a 16-month gestation period. It is the ninth white rhino born at Disney's Animal Kingdom, with Kendi being the first. (Photo by Gene Duncan/Disney Parks via Getty Images)
Baby elephant Nayan, aged two, gets cooled off with water by keepers at Chester Zoo on May 22, 2012 in Chester, England. As parts of Britain bask in temperatures up to 25c the herd of Indian elephants at Chester Zoo enjoyed a cool shower courtesy of the keepers and a hosepipe. (Photo by Christopher Furlong/Getty Images)
A rescued Black Bear carries a watermelon at The Wild Animal Sanctuary on the prairie near Keenesburg, Colorado May 22, 2012. The 720 acre (291 hectares) sanctuary is a refuge for large carnivores such as tigers, bears and lions that have been seized from illegal or abusive cases around the world. REUTERS/Rick Wilking
Visitors walk on a new elevated walkway as they pass by a rescued tiger at The Wild Animal Sanctuary on the prairie near Keenesburg, Colorado May 22, 2012. The 720 acre (291 hectares) sanctuary is a refuge for large carnivores such as tigers, bears and lions that have been seized from illegal or abusive cases around the world. REUTERS/Rick Wilking
Lions of Vladislav Goncharov perform during the awards ceremony for the 36th Monte-Carlo International Circus Festival in Monaco on January 24, 2012. The International Circus Festival will take place from January 19 to January 29, 2012. AFP PHOTO POOL / VALERY HACHE
Baby zebu Lea stands next to her mother Franka on January 27, 2012 at the Tierpark zoo in Berlin. Lea was born on January 14, 2012 at the zoo. AFP PHOTO / BRITTA PEDERSEN
A snowy white owl takes flight in this undated handout photo courtesy of U.S. Fish & Wildlife Service. Bird enthusiasts are reporting rising numbers of snowy owls from the Arctic winging into the lower 48 states this winter in a mass southern migration that a leading owl researcher called "unbelievable" according to Denver Holt, head of Owl Research Institute in Montana. REUTERS/U.S. Fish&Wildlife Service/Handout
A two-day-old camel calf stands next to her mother Barbara at the Ramat Gan Safari near Tel Aviv January 19, 2012. REUTERS/Nir Elias
Yuan Zi, a male giant panda, bites on bamboo inside his enclosure at the ZooParc de Beauval in Saint-Aignan, Central France January 17, 2012. A pair of giant pandas, which have been loaned to the zoo by China, will be on public view for the first time on February 11, 2012. REUTERS/Benoit Tessier
A four-month-old lion cub, which was originally from Africa, is seen inside its cage at Jordan's zoo in Yaduda December 15, 2011. REUTERS/Ali Jarekji
A nine day old mona monkey is bottle-fed by its keeper on December 19, 2011 at the zoo in Magdeburg, eastern Germany. In the wild, the guenons live mainly in western African forests. AFP PHOTO / JENS WOLF
Walker, a 58 stone (368 kg) polar bear, chases a plastic helmet in a pond on his third birthday at the Highland Wildlife Park in Kincraig, Scotland December 7, 2011. Walker was born in Rhenen Zoo in Holland and came to live at the Highland Wildlife Park after his aunt, Freedom, became pregnant and needed space to retire to her cubbing den. Winds of up to 70mph are expected to hit Scotland today, and snow in the Highlands is expected to be deeper than 10cm in places. REUTERS/Russell Cheyne
Toque macaque Safra carries her five weeks old baby on November 29, 2011 at the zoo in Berlin. The little monkey was born on October 22, 2011 at the zoo. Toque macaques are endemic to Sri Lanka. AFP PHOTO / ROBERT SCHLESINGER
Two baboons hold their one-month-old baby at a zoo in Yaduda December 15, 2011. REUTERS/Ali Jarekji
Two lions with their four-month-old cubs are seen in their cage at a zoo in Yaduda December 15, 2011. REUTERS/Ali Jarekji
Valentina, a lioness, looks on next to her three cubs during a media photocall at the Santa Fe Zoo in Medellin November 4, 2011. These lion cubs were born in the Zoo on October 9, 2011. REUTERS/Fredy Amariles
Orang-Utan mother Daisy holds her baby Dodi on his second birthday on November 24, 2011 at the zoo in Dresden, eastern Germany. Dodi loves to play a lot and already test to impress.
Female Amur tiger Iris licks its 7-week-old cub during one of their first walks in an open-air cage at the Royev Ruchey zoo in Russia's Siberian city of Krasnoyarsk September 29, 2011. Iris gave birth to three cubs in the beginning of August, according to zoo employees. The Amur tiger is an endangered species. REUTERS/Ilya Naymushin
A newborn elephant stands with his mother in the flooded Ayutthaya province, 80 km (49 miles) north of Bangkok October 13, 2011. REUTERS/Sukree Sukplang
Giant panda cubs lie in a crib at Chengdu Research Base of Giant Panda Breeding in Chengdu, Sichuan province October 11, 2011. REUTERS/China Daily