A zoo keeper holds one of three eight week old fishing cat cubs at the Zoo in Duisburg, Germany, on Wednesday, August 28, 2013. The cubs with webs on their paws are quite rare and belong to a threatened species. The cats are able to swim to chase for fish. (Photo by FrankAugstein/AP Photo)

Four caracal cubs sit in a basket as they are presented to media for the first time at the Animal Park Zoo in Berlin, Friday, August 30, 2013. The caracals, also known as desert lynxes, were born in the Zoo on July 21, 2013. (Photo by Markus Schreiber/AP Photo)

One of five Willard Bay beavers brought back to health emerges from a plastic tunnel from its starter lodge at its new home in the Uinta Mountains in Box Elder County, Utah, on August 13, 2013. The beavers were burned by petroleum and suffered respiratory and gastrointestinal problems after a March diesel fuel spill in Willard Bay. (Photo by Al Hartmann/The Salt Lake Tribune)

A male albino caiman alligator (caiman crocodilus yacare) called “Bino” relaxes in the water after receiving acupuncture treatment at Sao Paulo aquarium in Sao Paulo, on August 13, 2013. “Bino” is receiving weekly applications of acupuncture for the treatment of Scoliosis and Kyphosis. (Photo by Paulo Whitaker/Reuters)

Zoo keepers Juliane Country hold a two-month-old female panda during a prophylaxis on August 22, 2013 at the Zoo in Leipzig, eastern Germany. (Photo by Hendrik Schmidt/AFP Photo/DPA)

A young giraffe tries to reach food with its tongue at the Zoo in Dortmund, Germany, 29 August 2013. A second full grown giraffe stands next to it. (Photo by Jan-Philipp Strobel/EPA)

Participants compete in a horse race in Khui Doloon Khudag, Mongolia, on August 10, 2013. The race, which included 3000 horses, aimed to set a new Guinness World Record. (Photo by B. Rentsendorj/Reuters)

A newly born panda cub at the Zoo in Taipei, on August 21, 2013. (Photo by AFP Photo/Getty Images)

An Asian elephant eats a watermelon on a hot day at the Everland amusement park in Yongin, on August 11, 2013. (Photo by /Lee Jae-Won/Reuters)

A pint-sized pygmy marmoset steals the limelight as its infants crouch behind, on August 26, 2013. (Photo by ZSSD/Minden/Solent News)

Meet the real beach babes: the herd of pigs that live a life of luxury paddling in the crystal clear waters of the Bahamas, on August 28, 2013. (Photo by Caters News)

A friendly seal appears to kiss the glass of its aquarium tank as an excited young boy holds out a welcoming hand in Portland, Oregon, on August 28, 2013. (Photo by Renae Smith/Solent News)

A snow leopard cub born on April 9 is seen in his enclosure in the Himalayan Highlands exhibit at the Bronx Zoo in New York, on August 28, 2013. (Photo by Julie Larsen Maher/Reuters)

Four inquisitive killer whales gather to inspect visitors against a glass panel at Seaworld in San Diego, California, on August 10, 2013. (Photo by Sandy Huffaker/Barcroft Media)

Nadine Darsanlal with her pet service pig in New York City, on August 15, 2013. Emotional support animal, Wilbur, accompanies Nadine, a disabled Navy veteran, everywhere she goes, providing therapeutic benefits through companionship and affection. (Photo by Alexandre Ayer/Barcroft Media)

An ambush of Siberian tigers lick ice cubes to cool off in Guaipo Siberian Tiger Park in Shenyang, northeast China's Liaoning province, on August 15, 2013. (Photo by AFP Photo)

Woodpeckers are like buses, you wait all day and suddenly two come along at the same time! Photographer Marina Scarr snapped what appears to be a red-headed woodpecker with two heads, on August 16, 2013. (Photo by Marina Scarr/Caters News)

An Indian nomad herder leaps off the back of a water buffalo into the flooded waters of the River Tawi on the outskirts of Jammu, India, on August 25, 2013. (Photo by AFP Photo/Getty Images)

A sphynx cat is pictured during the “Dog & Cat” pet fair in Leipzig, Germany, on August 25, 2013. (Photo by Hendrik Schmidt/AFP/Getty Images)

A forest guard looks at an one-horned rhinoceros in a paddy field at Rajbhoral village in Sonitpur district of Assam state, India, on August 20, 2013. The Rhino strayed away from the nearby Kaziranga National Park. Assam is home for the world's largest concentration of rhinos. (Photo by Anupam Nath/Assoicated Press)

A smooth dogfish is swallowed by a sand tiger shark, which in turn was caught by researchers at the University of Delaware's Ocean Exploration, Remote Sensing, Biogeography (ORB) Lab. (Photo by University of Delaware)

A 2-month-old snow leopard cub is photographed by the press at the Brookfield Zoo in Illinois. The cub was born on June 13. (Photo by Chicago Zoological Society via Reuters)

The giant panda cub born on August 23 at the Smithsonian's National Zoo receives an exam from animal care staff in Washington, DC. Chief veterinarian Suzan Murray reports that the cub is robust, has a steady heartbeat, a full belly (is nursing well), and has successfully passed fecals. (Photo by Courtney Janney/ Smithsonian's National Zoo)

A visitor holds an albino hedgehog in a private zoo in Moscow, Russia, on August 22, 2013. Three rare albino hedgehog babies, born on the same day as Britain's new prince, have moved into a miniature castle at a Moscow petting Zoo. (Photo by Alexander Zemlianichenko Jr./AP Photo)

A young red kangaroo looks out from its mother's pouch at the Hanover Zoo in Germany on August 27, 2013. (Photo by Holger Hollemann/AFP Photo)

Pelicans wait for food with open beaks during feeding time in the bird park in Yokohama, Japan, on August 21, 2013. (Photo by AFP Photo)