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In this photo provided by the San Diego Zoo showing the panda cub at the San Diego Zoo during his fifth veterinary exam on Friday Sept.20,2012. The male panda, born on July 29, 2012, weighed 4.9 pounds (2.26 kilograms), nearly a pound more than he weighed during the last exam. Veterinarians recorded that the cubís eyes are almost open now and believe the cub can see but is likely limited to viewing light and shadows. The San Diego Zoo follows the Chinese cultural tradition of naming the giant panda after it is 100 days old. (AP Photo/San Diego Zoo/Tammy Spratt)

Baby jaguar Spotti is seen at the Attica Zoological Park east of Athens. The jaguar, weighed 4.5 kilograms (9.9 pounds) at the time of the photo, was born at a zoo in Germany. (AP Photo/Thanassis Stavrakis)

A baby hippo (no name given yet) is seen in its enclosure at the Zoo in Berlin on November 1, 2011. The youngster born on October 23rd is the latest addition to the hippo population at zoological garden in the German capital and was unveiled to the public this morning. ODD ANDERSEN/AFP/Getty Images

One of nine baby great horned owls whose nests were destroyed and are being raised by veterinarians at the school is seen Monday, April 23, 2012, in Pullman, Wash. The babies, five from one nest and four from another, are being hand-fed cut-up mice soaked in water until they are strong enough to eat on their own. The first four were brought to the university April 13 at roughly one week old. Just four days later, the second group arrived at only a few days old. (AP Photo/Washington State University, Linda Weiford)

Baby crocodiles swim at the "La Boca" crocodile farm in the Cienaga de Zapata national park, Cuba. The crocodile nursery is a top attraction at the park, Cuba's equivalent of the Florida Everglades, the Caribbean's largest bioreserve with 1.5 million acres of mangrove-choked canals teeming with the wildest Cuban wildlife. (AP Photo/Franklin Reyes)

Two baby meerkats, left, hang around an adult meerkat at the Erie Zoo in Erie, Pa. on March 13, 2012. The meerkats were born at the zoo in January 2012. (AP Photo/Erie Times-News, Greg Wohlford)

Two-month-old Charlees, whose name is Hindi for Charlie, makes her public debut at the San Diego Zoo Safari Park on March 20, 2012 after a rainstorm came through San Diego County this past weekend. The sunshine, combined with her first opportunity to explore the 40-acre Asian Savanna habitat, was a perfect mix for fun. She spent the morning running around meeting the rest of the Park's seven-member greater one-horned rhino herd. Charlees is the 61st greater one-horned rhino born at the Safari Park since 1975, making the Park the foremost breeding facility in the world for this species. Once widespread in Southeast Asia, the greater one-horned rhinoceros now numbers approximately 2,800 and is listed as an endangered species by the International Union for Conservation of Nature. (KEN BOHN/AFP/Getty Images)

Giraffe mother Malindi caresses her daughter at Duisburg zoo. Visitors were asked to make suggestions for a name for the youngster. (AP Photo/Frank Augstein)

A turtle swims with its baby on its back in a pool in Hanshan Temple on the outskirts of Suzhou, east China's Jiangsu Province. Hundreds of turtles in over 10 varieties at the temple attract visitors in summer, Xinhua said. (AP Photo/Xinhua, Wang Jianzhong)

The Dublin Zoo's female Brazilian Tapir baby takes some exercise. The calf was the twelfth offspring of mother Harriet. Found in low lying forests, Brazilian Tapirs give birth to a single young after a 13 month gestation period, with the animals losing their distinctive striped pattern - which acts as camouflage on the forest floor - after around a year. (AP Photo/PA, Haydn West)

Cotton-Top Tamarin monkeys, from left: Rio, Baby and Pinkie are pictured back home at Drayton Manor Theme Park and Zoo in Tamworth, England, after being stolen in an overninght raid earlier in the week. The trio was recovered during police raids on 2 locations in the Erdington district of Birmingham, England, and are being assessed by keepers. (AP Photo/PA, David Jones)

Baby, a new arrival at the Melbourne Zoo, keeps a close eye on her mother's foot after going on display to the public for the first time. Baby was only the second elephant born in Australia and the first one born from successful artificial insemination. Three weeks after birth, Baby weighed 136 kilos. (WILLIAM WEST/AFP/Getty Images)

A two-day-old male black rhinoceros baby stands next to his mother Tanda at the Ramat Gan Safari near Tel Aviv, Israel. The newborn rhinoceros was the first rhinoceros to be born in captivity in Israel in 15 years. (AP Photo/Ariel Schalit)

A still nameless young ocelot stands beside his mother Estancia at their enclosure of the Hellabrunn zoo in Munich, southern Germany. The baby ocelot was 80 days old at the time. (LENNART PREISS/AFP/Getty Images)

Baby Mandrill, Blanca, is fed by her mother, Bunny, at Bioparco Zoo in Rome. Blanca weighted around a half a kilo at birth. After a gestation period of 220 days, females give birth to one infant. The skin colors of Mandrills brighten as the animal gets more excited. (TIZIANA FABI/AFP/Getty Images)

Flossie, an adult female ring tailed Lemur feeds one of her three-month-old babies Wednesday, July 13, 2005 at the Singapore Zoo. Flossie and an adult male, Ike, who like the lemur stars of the animated film "Madagascar," are originally from Madagascar, but arrived earlier this year from a Canadian zoo.(AP Photo/Ed Wray)

A black rhinoceros baby stands underneath its mother in their enclosure in the zoo in Berlin. (Timur Emek/AFP/Getty Images)

Animal keeper Sabina Gloecknerova holds a three-week-old male Celebes Crested Macaque at the zoo in Decin, north of Prague. The baby ape, named Satu, was refused by his mother and intensive human care for Satu is now inevitable. (AP Photo / CTK, Libor Zavoral)

A baby kangaroo looks out from its mother's pouch at the zoo in Hanover, northern Germany. (JOCHEN LUEBKE/AFP/Getty Images)

The nine-year-old chimpanzee "Pia" nurses her newly-born baby "Amelie" in their enclosure at the Serengeti Park in Hodenhagen near the northern German city of Hanover. (STEFAN SIMONSEN/AFP/Getty Images)

A baby snow leopard crawls on a blanket in Mayor Martin Chavez' conference room in Albuquerque, N.M. The baby snow leopard was born at the Albuquerque Bio Park. (AP Photo/The Albuquerque Journal, Pat Vasquez-Cunningham) **

Taronga Zoo's latest elephant baby, as yet unnamed, stays close to his mother Porntip at Taronga Zoo in Sydney, Australia. The Asian Elephant calf has continued to make progress following a protracted labour that spanned six days. The calf was originally believed to have died in the womb during labour but surprised veterinarians and zoo staff with an unexpected delivery early Wednesday morning. (Photo by Bobby-Jo Vial/Taronga Zoo via Getty Images)

Female Indian rhinoceros baby "Seto Paitala" (Nepalese for "White Foot") stands next to her mother Purana in their enclosure at the Nuremberg Tierpark. The rhinoceros was born at the zoo one week ago. The "Rhinoceros unicornis" is a large mammal living in north-eastern India and Nepal. (TIMM SCHAMBERGER/AFP/Getty Images)

A Bengal tiger cub intimates with its mother at a wild zoo in Jinan, capital of east China's Shandong Province. Four two-month-old Bengal tiger cubs debut with their mother at the zoo on Monday. The eight-year-old Bengal tiger mother has given birth to 12 babies, nine of which are white tigers. (AP Photo/Xinhua, Lu Chuanquan)

A three-day-old baby seal swims with its mother in a pool at the zoo in the western German town of Duisburg. The seal baby named Emmy already weighs six kilogram. (SASCHA SCHUERMANN/AFP/Getty Images)

This is a Japanese Macaque monkey mom and her baby of the same type that were used in the study. The monkeys live at the Oregon National Primate Research Center at the Oregon Health and Science University in Beaverton, Oregon. (Photo courtesy Oregon Health and Science University

A newborn Asian elephant stands with other members of its herd at Whipsnade Wild Animal Park in Whipsnade, England. The 6-day-old Asian elephant (Elephas maximus) was three feet tall. (Photo by Dan Kitwood/Getty Images)

Polar bear Corinna stands in front of her baby Wilbaer during his first outing at the Wilhelma zoo in Stuttgart, southern Germany. (MICHAEL LATZ/AFP/Getty Images)

Baby Pygmy Hippopotamus Paul plays next to his mother Debby in their enclosure at the zoo in Berlin. Pygmy Hippopotamus are native to the forests and swamps of western Africa. (AXEL SCHMIDT/AFP/Getty Images)

Orangutan baby Duran lies in the arms of its mother Djudi at the zoo in Dresden, eastern Germany. Duran was the fifth baby of the 36-year-old orangutan mother Djudi. (NORBERT MILLAUER/AFP/Getty Images)

A lamb flies through the air in a pasture at the Comstock House Bed & Breakfast on Monday, March 19, 2012 in Plainfield, Vt.(AP Photo/Toby Talbot)

Katina, a 34-year-old killer whale, swims with her baby at SeaWorld Orlando in Orlando, Fla. Katina gave birth to her seventh calf. Park officials say the baby is 7-feet long and weighs 350 pounds. It was the 16th born at SeaWorld Orlando. (AP Photo/SeaWorld Orlando, Chris Gotshall)

Western Lowland Gorilla mother Bana hold her new her baby which was born on Nov. 16, 2011. The baby which has yet to be named joins a troop of seven Western Lowland Gorillas at the zoo. The newborn girl is the first of this critically endangered species to be born at the zoo since 2005. (AP Photo/ Lincoln Park Zoo, Todd Rosenberg)

A moose and its baby stand in the woods on Isle Royale, Mich. Mercilessly hounded by blood-sucking ticks, the Isle Royale moose herd is on a downward spiral, and the wolf packs that roam the national park in Lake Superior are taking advantage. (AP Photo/Michigan Tech University, John and Leah Vucetich)

The three baby meerkats cuddle in the cold at Bristol Zoo in Bristol, England. The four-week-old new arrivals, two boys and a girl, were being well looked after by the other four adult meerkats and are already proving a hit with visitors. Meerkats are quite lively and sociable animals, carnivores and belong to the family of mongooses, but can only be found in Southern Africa, in places like the Kalahari Desert, Namibia and Botswana. (Photo by Matt Cardy/Getty Images)

An un-named baby elephant is seen through the legs of its mother, Porntip, at Taronga Zoo in Sydney, Australia. The calf that was believed to have died during a nine-day labor is feeding itself and has earned the nickname "Mr. Shuffles" since learning to stand after it was born early Wednesday. (AP Photo/Bobby-Jo Vial)

A 3-day-old baby zebra stands with his mother Yoko at a zoo in Lima, Peru. The baby was the second zebra born in captivity in Peru. (AP Photo/Martin Mejia)

Bonobo baby Sambo looks into the camera in the zoo of Frankfurt, Germany, Tuesday, April 24, 2012. The male chimpanzee baby was born on January 7 and had to be raised by hand. During the next days the baby will meet with his fellow species in the zoo. (AP Photo/Michael Probst)

A baby Canada goose plays with a blade of grass under the watchful eye of his parent along The National Mall in Washington. (AP Photo/Haraz N. Ghanbari)

A baby Giraffe stands next to its mother in the zoo in Hanover. (NIGEL TREBLIN/AFP/Getty Images)

Female dachshund Bessi lays in a basket with a five-day-old baby tiger at the wild animal park Ismer in Stroehen, western Germany. Dachshund "Monster", who initially adopted the baby tiger cast out by its mother, died in a car accident. and Bessi has taken over the role. (PHILIPP GUELLAND/AFP/Getty Images)

A baby coatis is carried by its mother in their enclosure at the zoo in the northern German city of Hanover. The young coatis are also known as the hog-nosed coons. (NIGEL TREBLIN/AFP/Getty Images)

A nine-day-old baby elephant sticks with his eighteen-year-old mother Tini at the Safari Park in Gianyar, on the Indonesian resort island of Bali. The male Sumatran elephant baby, the 31st at the park, was the first baby elephant born on Bali island. (SONNY TUMBELAKA/AFP/Getty Images)

Gorilla Bahgira nurses her baby Kajolu in their ape house at the zoo in Munich, southern Germany. (AP Photo/dapd//Uwe Lein)

Orang-Utan mother Daisy kisses her baby Dodi at the zoo in Dresden, eastern Germany, where Daisy was born. (NORBERT MILLAUER/AFP/Getty Images)

Baby penquins wait for their first check up in a plastic bin at the San Francisco Zoo. Zoo and Animal staff pulled eight five-week-old Magellanic penguin chicks from their parents burrows for medical examinations. (AP Photo/San Francisco Chronicle, Deanne Fitzmaurice)

Gorilla mother "Gana" holds her young baby in their enclosure at the zoo in the western German city of Muenster. The baby named Claudia was born a day earlier at the zoo. (PHILIPP GUELLAND/AFP/Getty Images)

A baby giant anteater, born at the National Zoo in Washington, rests on its mother Maripi at the zoo. Zoo staff had not yet been able to determine the baby's sex or weight. This is Maripi's second offspring born at the zoo. (AFP/Getty Images)

A two-day-old baby elephant named "Jamuna Toni" investigates her enclosure at Hellabrunn Zoo in the southern German city of Munich. (JOERG KOCH/AFP/Getty Images)

A seven month old baby Koala clings to his mother, Colliet, at the Cleveland Metroparks Zoo in Cleveland. (AP Photo/Mark Duncan)

A baby zebra jumps in her enclosure at the zoo at the western German town of Wuppertal. A(SASCHA SCHUERMANN/AFP/Getty Images)

Goldie, a female southern hairy-nosed wombat joey stays near her mother, Kambora, at the Brookfield Zoo's Australia House. Goldie was the first born in North America since 2000 and the first at Brookfield Zoo since 1993. (AP Photo/Chicago Zoological Society, Jim Schulz)

Two young tigers are pictured on November 20, 2011 at the zoo in Magdeburg, eastern Germany. The two female tiger babies were born at the zoo on September 26, 2011, and were presented to visitors for the first time. (JENS WOLF/AFP/Getty Images)

Keyah, a baby white rhino weighing 30kg, stands by its mother at the Cerza zoo in Hermival-les-Vaux. The birth in captivity of white rhinos are very rare, one to two per year in Europe. (MYCHELE DANIAU/AFP/Getty Images)

Two red river hog piglets are bottle-fed. Both were treated for sepsis and are being hand-reared. Some baby animals end up being raised by zoo staff because they have been ill or their mothers can't do the job. (Los Angeles Times photo by Glenn Koenig.)

Five-weeks old baby lions (L-R) Nala, Simba and Asali pose for a group photo after a clinical routine examination at the Serengeti-Park animal park in Hodenhagen, central Germany. The examination included a check of their teeth, claws, eyes and ears as well as a behaviour test and the determination of their weight. (HOLGER HOLLEMANN/AFP/Getty Images)

A two-week-old Bornean Orangutan named Iznee, left, is seen in the arms of her mother, Sarikei, inside their enclosure at Chester Zoo, Chester, England. Iznee is the first baby Orangutan born at the zoo for ten years. The zoo is home to over 7,000 animals and 400 different species, including some of the most endangered species on the planet.(AP Photo/Paul Thomas

Florales, a 14-day-old South American Tapir girl is presented to the press for the first time at the zoo in Zurich, Switzerland. Florales is the 22nd tapir born in Zurich's zoo. (AP Photo/KEYSTONE/Eddy Risch)

Three baby tigers stay near their mother at the Siberian Tiger Park in Harbin, capital of northeast China's Heilongjiang Province. More than 100 Siberian tigers, one of the rarest animals, are expected to be born this year at a breeding center in China's northeast, an official said Monday. (AP Photo/Xinhua, Lu Jinbo)

A baby duck enjoy a swim and a drink in Denver's City Park on Monday. The name of the lake where this tiny duck swims? It is Duck Lake in City Park along the south side of the Denver Zoo. (The Denver Post/Lyn Alweis)

A hippo baby Farasi lies in its enclosure along with mother Helvetia in the zoo in Basel, Switzerland. (AP Photo/Keystone, Andreas Frossard, File)

A baby of white-rumped vulture is seen at Preah Vihear province, about 245 kilometers (152 miles) north of Phnom Penh, Cambodia. Eight critically-endangered were found dead in the jungle of Cambodia after feeding on the corpse of a poisoned buffalo and dog. (AP Photo/Wildlife Conservation Society)

A baby gorilla shouts from atop its mothers back in the Republic of Congo. Female gorillas produce on the average one baby about every five years. A new census conducted by WCS and the government of the Republic of Congo tallied more than 125,000 western lowland gorillas in the northern part of the country. Previous estimates from the 1980s placed the entire population of western lowland gorillas, which occur in seven Central African nations, at less than 100,000. (AP Photo/Wildlife Conservation Society, Thomas Breuer)

Baby Bactrian camel, Genghis, right, stands with his mother, Edina, at Twycross Zoo, Atherstone, England. There are less than a thousand Bactrian camel, which are native to the steppes of eastern Asia, left in the wild. The Bactrian camel has two hums on its back, in contrast to the dromedary, also known as the Arabian Camel, which has one. (AP Photo/Simon Dawson)

Baby bottlenose dolphin Doerte and her mother Delphi swim through their basin at the zoo in Duisburg, western Germany. Doerte, almost two months old, was still fed milk by her mother. (ROLAND WEIHRAUCH/AFP/Getty Images)

The Denver Zoo celebrated the birth of an endangered eastern bongo antelope. Zookeepers named the rambunctious male calf Mkono, (muh-kone-oh) which means "handful" in Swahili. Mkono is the fifth calf born to mother, Megan. At Mkono's baby wellness exam, zoo veterinarians gave the new calf a clean bill of health. The young calf weighed in at 45 pounds but when he is full grown, he could weigh up to 900 pounds. Zookeepers say the youngster is very adventurous and is enjoying exploring his new outdoor surroundings under mother's watchful eye. (David Parsons, Denver Zoo)

Southeast Asian clouded leopards, (Neofelis Nebulosa) are seen at Jardin des Plantes Zoological in Paris. The two female cubs are named Pati and Jaya. (AP Photo/Francois Mori)

Tai and Pip, twin red pandas, sleep in the hands of Sandy Helliker, a animal health technologist at the Edmonton Valley Zoo in Edmonton, Alberta, Canada. The pandas were receiving round the clock care from Helliker who hand feeds them with baby bottles. They were taken from their mother after she showed aggression towards one of the babies. Only four babies were born in North America last year, two at the Edmonton Zoo, one in Calgary and one in Winnipeg. There are between 2,000 and 5,000 red pandas in the wild. They are native to the Himalayas in India and Nepal and southern China. (AP Photo/The Canadian Press,Jason Scott)

Vasan, a baby Tapir with its mother Sayang, exploring their enclosure at Edinburgh Zoo, Scotland. The birth is a special event as it is the first time a Malayan Tapir has been born at the zoo and is also the first baby for this particular adult Tapir. Tapirs are hoofed mammals and are related to rhinos and horses. (AP Photo/Andrew Milligan,PA)

A baby kangaroo named Tijana is seen being hand fed through the window of the incubator in Belgrade Zoo. Her mother, after being scared by an emu, a large Australian bird, ran away and 6-month-old Tijana fell out from the pouch. Now, the big-eyed baby kangaroo, which normally would feed on her mother's milk inside the pouch, was being fed in an incubator with special milk donated by Australia, the United States and Germany. (AP Photo/Srdjan Ilic)

A baby slender loris is seen in this undated photograph released by the Zoological Society of London. It isn't often that the northern hairy-nosed wombat, the slender loris, and the pygmy hippopotamus share the spotlight. But these strange and unusual animals are the focus of a conservation program launched Tuesday by the Zoological Society of London, one that aims to eventually secure the existence of some of the world's rarest mammals. The program, called EDGE (for Evolutionarily Distinct and Globally Endangered) targets 100 species for scientific study, and the zoological society aims to take action on the top ten by the end of the year. (AP Photo/Zoological Society of London)

Vale, a four week old red titi monkey, sits on his dad Thiago's back in the rainforest biome at London Zoo in England. The tiny monkey was born to parents Yara and Thiago. (Photo by Peter Macdiarmid/Getty Images)

A still to be named baby giraffe cleans its self while outside Tuesday Sept. 18, 2012 at the Great Plains Zoo in Sioux Falls, S.D. (AP Photo/Argus Leader, Melissa Sue Gerrits)

Ayu Rosalina, a two-day old baby Sumatran Elephant, stands near her mother at Conservation Response Unit (CRU) in Ulu Masen, Aceh Jaya, Aceh, Indonesia, Thursday, Sept 20, 2012.(AP Photo/Heri Juanda)

A baby two-toed sloth (Choloepus) eats fruit at the Aiunau Foundation in Caldas, some 25 km south of Medellin, Antioquia department, Colombia on September 15, 2012. Croatian scientist Tinka Plese created the foundation 10 years ago, where sloths --which have been captured by illegal wildlife traffickers and then sold to people between US40 to 150 dollars-- are rescued, rehabilitated and released. More than 700 sloths have been released to date. RAUL ARBOLEDA/AFP/GettyImages

A six-day-old hippopotamus is pictured next to his mother, Kara, aged 21, on September 12, 2012 at "Planet sauvage" (wild planet) zoo in Port-Saint-Pere, western France. The birth, a rare event for this species in captivity, occured on September 7, 2012 in the zoo FRANK PERRY/AFP/GettyImages

A rescued young tawny owl perches on a branch as it waits to be released back into the wild at the RSPCA West Hatch Wildlife Centre on August 28, 2012 in Taunton, England. Between January and the end of July, 33 of the baby birds were taken to the RSPCA centre in Somerset for care, a large increase on previous years. Although the exact reason for this rise is unclear, it is thought the topsy-turvy weather conditions and some extremely windy days through the spring and summer may have contributed. (Photo by Matt Cardy/Getty Images)

A three-month-old Orangutan baby (Pongo Pygmaeus Mario) peeks out from inside a wooden box in East Kutai, East Kalimantan province, on December 9, 2011 after being rescued after seperated from its mother. Expert say there are about 50,000 to 60,000 orangutans left in the wild, 80 percent of them in Indonesia and the rest in Malaysia. (FIRMAN/AFP/Getty Images)

Saarai, the Cincinnati Zoo & Botanical Gardenís 3-year-old Bactrian camel, stands over her calf on Thursday, April 26, 2012. Saarai gave birth to her first calf, a male, on Monday, April 23, 2012. It is the first camel been born at the zoo since 1983. The Zoo is asking for help in naming the baby. Keepers have selected their top three choices- Henry, Lyn and Cain- and the public can vote for their favorite, among the three, online at www.cincinnatizoo.org through Monday, April 30. The winning name will be announced on Tuesday, May 1. (AP Photo/The Enquirer, Cara Owsley)

In this photo provided by SeaWorld Orlando, Katina, a 34-year-old killer whale, is shown with her baby whale at SeaWorld Orlando in Orlando, Fla. Katina gave birth Saturday night to her seventh calf. Park officials say the baby is 7-feet long and weighs 350 pounds. It is the 16th born at SeaWorld Orlando. (AP Photo/SeaWorld Orlando, Chris Gotshall)

Southeast Asian clouded leopards, (Neofelis Nebulosa) are seen at Jardin des Plantes Zoological in Paris, Thursday, July 22, 2010. The two female cubs, named Pati and Jaya, born on May 14, 2010, recently made their first appearance in public . (AP Photo/Francois Mori)

A baby elephant walks throuh its enclosure at the Tierpark Hellabrunn zoo in Munich, southern Germany, on December 9, 2011. The animal was born at the zoo three months ago. (ANDREAS GEBERT/AFP/Getty Images)

Hungry baby mocking birds, less than 24 hours old, cry for food from a nest deep inside a sago palm near the clubhouse of City Park Golf Course in Baton Rouge, La. Mockingbirds typically build nests close to the ground and lay three to five eggs which take about two weeks to hatch. The nesting period is from April to September. (AP Photo/The Advocate, Kerry Maloney)

A grizzly bear cub in Anchorage, Alaska. Three Alaska grizzly bear cubs orphaned when their mother was killed, will soon be calling the Detroit Zoo home. The 11-month-old brothers were orphaned in October when their mother was shot. After the hungry cubs were seen numerous times looking for food in backyards and around homes, the Alaska Department of Fish and Game decided to put them into custody. (AP Photo/John Gomes, Alaska Zoo)

A baby hippopotamus swims with 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)

A rare five-month-old female Clouded Leopard cub is shown during a media preview, Tuesday, Nov. 15, 2011 at Zoo Miami in Miami. The female and a seven-month-old male which both arrived at the zoo Saturday, will be on display after a 30-day quarantine period. The highly endangered leopards are found in forests of Southern China, Taiwan, and Malaysia. (AP Photo/Wilfredo Lee)

A baby Colobus monkey born early Thursday morning, March 8, 2010 is held by her mother, Jabula, at Safari West in Santa Rosa, Calif. "Colobus" means "mutilated" in Greek, because they have no prominent thumb. They live high in the tree tops, so the thumb gets in the way of their long fingers as they launch themselves from branch to branch. (AP Photo/The Press Democrat, John Burgess)

One of the Cleveland Metroparks Zoo's four 11-month-old grizzly bear cubs enjoys a pumpkin for a snack at the Zoo in Cleveland on Tuesday, Nov. 22, 2011. Besides providing the animals with enrichment, the pumpkins are a preview to the treats many of the animals will receive this coming Thursday, which is Thanksgiving Day. The Zoo is open and free to the public on Thanksgiving Day as well. (AP Photo/Amy Sancetta)

baby two-toed sloth (Choloepus) eats fruit at the Aiunau Foundation in Caldas, some 25 km south of Medellin, Antioquia department, Colombia on September 15, 2012. Croatian scientist Tinka Plese created the foundation 10 years ago, where sloths --which have been captured by illegal wildlife traffickers and then sold to people between US40 to 150 dollars-- are rescued, rehabilitated and released. More than 700 sloths have been released to date. RAUL ARBOLEDA/AFP/GettyImages

Moka, an endangered western lowland Gorilla, plays with her unnamed 3-month-old baby at the Pittsburgh Zoo and Aquarium in Pittsburgh, Wednesday, May 2, 2012. (AP Photo/Gene J. Puskar)

A still unnamed King penguin chick that hatched on April 9 is unveiled at The Aquarium at Moody Gardens, Monday, April 23, 2012, in Galveston, Texas. A blood test will be conducted to determine the gender of the bird who came into life weighing about 20 ounces. This chick is the 14th King penguin chick to have been successfully bred at the aquarium. Due to space limitations, this chick will be go to another facility once weaned from its parents. The chick currently is in the main penguin exhibit at the aquarium which also home to Gentoo, Macaroni, Rockhopper and Chinstrap penguins. (AP Photo/Houston Chronicle, Johnny Hanson)

Tanda the rhinoceros and her four-hour-old baby are seen at the Ramat Gan Safari, an open-air zoo near Tel Aviv, on June 15, 2012. JACK GUEZ/AFP/GettyImages

Chikita, a five-month-old tiger cat cub is pictured, on August 2, 2012 at the zoo in Mulhouse, eastern France. SEBASTIEN BOZON/AFP/GettyImages

Baby tapir Parima enjoys some leaves during its first outing at its open air enclosure of the Tierpark Hagenbeck zoo in Hamburg, northern Germany, on May 15, 2012. Parima was born on May 1, 2012 at the zoo and is named after a nature protection area in Venezuela. DANIEL REINHARDT/AFP/GettyImages

A baby kangaroo looks out from his mother's pouch in the Erfurt zoo, central Germany, Thursday, March 8, 2012. (AP Photo/Jens Meyer)

Asian elephants take a bath in a pool at the zoo in Hanover, northern Germany, on April 27, 2012. Five baby elephants are raised in the zoo Hanover. HOLGER HOLLEMANN/AFP/GettyImages

Baby polar bear Anori sticks out her tongue in her enclosure at the zoo in Wuppertal, western Germany, on April 23, 2012. Anori was born on January 4, 2012 at the zoo and is a half-sister of world famous polar bear Knut, who died in 2011. (DANIEL NAUPOLD/AFP/Getty Images)

A baby giraffe named Kimarie, only a few days old, stands next to her mother Marie in an enclosure at the "ZOOM" Zoo in Gelsenkirchen, western Germany on March 12, 2012. The 170 cm tall baby giraffe was born 3 days ago. PATRIK STOLLARZ/AFP/Getty Images)

A quarantined black bear cub plays with his stuffed otter toy at The Oregon Zoo in Portland. (AP Photo/Oregon Zoo, Carli Davidson)