A 29-day-old Labrador puppy sleeps against a tree at a courtyard in Beijing August 10, 2014. (Photo by Jason Lee/Reuters)

Abass Yusuf holds in his mouth meat on a stick to feed a hyena in Harar, Ethiopia, on July 29, 2014. Yusuf has taken over his father's job to feed hyenas as many tourists come to feed the animals. (Photo by Zacharias Abubeker/AFP Photo)

Wyatt Van Handel makes a diving grab during the Pig Rassle event at The 44th Annual St. Patrick Catholic Church Roundup Sunday, August 10, 2014, in Stephensville, Wis. (Photo by Wm. Glasheen/AP Photo/The Post-Crescent)

Two unnamed female Sri Lankan baby leopards (Panthera pardus kotiya) are seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. (Photo by Yves Herman/Reuters)

Two unnamed female Sri Lankan baby leopards (Panthera pardus kotiya) are seen in a zoo in Maubeuge August 12, 2014. The Sri Lankan leopards, reported as an endangered animal species by the International Union for Conservation of Nature, were born on July 1, according to the zoo media office. (Photo by Yves Herman/Reuters)

People take photographs of the main tank of the Oceanarium of Lisbon, on August 13, 2014. (Photo by Francisco Seco/Associated Press)

A sheep walks along a dike near Norderfriedrichskoog, Germany, August 11, 2014. (Photo by Daniel Reinhardt/EPA)

Tourists join Bali Marine Police in releasing sea turtles at a beach in Kuta, Bali, Indonesia, August 13, 2014. Bali police officers released dozens of sea turtles back into the wild after they were seized from poachers. (Photo by Made Nagi/EPA)

The horse of the “Civetta” or Owl parish is escorted by its groom and followed by supporters as they leave Del Campo square in Siena August 13, 2014. Every year on July 2 and August 16, almost without fail since the mid-1600s, 10 riders compete bareback around Siena's shell-shaped central square in a bid to win the Palio, a silk banner depicting the Madonna and child. (Photo by Stefano Rellandini/Reuters)

A thirteen-week old white lion cub plays with his father Yabu, on August 15, 2014, at the zoo in La Fleche, western France. (Photo by Jean-Francois Monier/AFP Photo)

One of the three baby Meerkats nicknamed The Three Amigos is returned to the group after the three week olds were checked over by Keeper Connie McEwan at Blair Drummond Safari Park near Stirling, on August 15, 2014. (Photo by Andrew Milligan/PA Wire)

A fisherman gets ready to cast his line near the body of a dead humpback whale washed ashore on Macumba beach in Rio de Janeiro, Brazil, on August 11, 2014. (Photo by Yasuyoshi Chiba/AFP Photo)

Undated Maldives Whale Shark Research Programme handout photo of a researcher enjoying a whale shark encounter in the Maldives, as new research suggests that they are making unexpectedly big waves in the world of ecotourism. On their own, the majestic creatures living in a single Maldivian atoll account for nearly 3% of global tourism devoted to sharks, a study shows. (Photo by Melody Sky/PA Wire/Maldives Whale Shark Research Programme)

A young seal sits in a pushcart as it is brought to a ship from the seal station in Friedrichskoog, northern Germany, Sunday, August 10, 2014. The Seal Center Friedrichskoog is the only authorized shelter for abandoned or sick seals in the state of Schleswig-Holstein. The rearing and rehabilitation of seal pups are main aspects of the work during the summer. At the moment the first seals are being brought back by ship to their natural habitat. (Photo by Daniel Reinhardt/AP Photo/DPA)

A young seal is fed a fish at the seal station in Friedrichskoog, Germany, on August 10, 2014. The rearing and rehabilitation of seal pups are the main aspects of station's work during the summer. (Photo by Daniel Reinhardt/DPA)

Lowry Park Zoo elephants Matjeka, 23, and her 1-year-old daughter, Mavi, apply a liberal coating of “sunscreen” to themselves in a clay mud wallow at the park Tuesday, August 12, 2014, in Tampa, Fla., on the park's first observation of World Elephant Day to raise awareness of the wild African elephant crisis. “Elephants are prone to being sunburned”, said associate curator Chris Massaro. “What they need is lot of mud or clay to roll around in and cover up their skin so it will protect it from the sun”. (Photo by Cherie Diez/AP Photo/The Tampa Bay Times)

A girl drags her goat heading back home through a main road empty of traffic and full of children playing, after being blocked by the Pakistani police with shipping containers, on the outskirts of Islamabad, Pakistan, Thursday, August 14, 2014. Roads leading to the Capital are being blocked in run up to announced protests by cricketer-turned-politician Imran Khan and anti-government cleric Tahir-ul-Qadri. Both men want the government to step down and new elections to be held. (Photo by Muhammed Muheisen/AP Photo)

In this picture taken Friday, August 8, 2014, a gorilla is reflected in a glass panel in its compound at the Hellabrunn zoo in Munich, southern Germany. (Photo by Sven Hoppe/AP Photo/DPA)

A red-crowned crane spreads its wings in Zhalong Nature Reserve, in Heilongjiang province, August 11, 2014. The red-crowned crane is on the red list of endangered species released by the International Union for Conservation of Nature (IUCN), and its population continues to decline. (Photo by Jacky Chen/Reuters)

A brown fur seal (Arctocephalus pusillus) swims in its new pool enclosure in Wroclaw Zoo in Wroclaw, Poland, August 11, 2014. Visitors can observe brown fur seals and african pinguins at external pools viewpoints. The new African-Aquarium in Wroclaw Zoo, a new home for seals, penguins, sharks and many other species will be opened for public in 2015. (Photo by Maciej Kulczynski/EPA)

A female elephant plays with her baby on World Elephant Day at Margherita Ketetong village in Tinsukia district of Assam on August 12, 2014. The inaugural World Elephant Day was launched in 2012 to bring attention to the urgent plight of Asian and African elephants, with the escalation of poaching, habitat loss, human-elephant conflict and mistreatment in captivity some of the threats to elephants. (Photo by Manash Pratam Gogoi/AFP Photo)

A picture made available on 15 August 2014 shows Chinese tourists after paying an additional fee to pose for pictures holding a young tiger at Sriracha Tiger Zoo, in Pattaya district, southeast of Bangkok, Thailand, 08 August 2014. Thailand's zoos with often bizarre animal shows are under fire from animal lovers, critical both of the tourists who show no care for the species other than a chance for entertainment and having their photo taken, and the business exploitation and welfare of the animals critics say have nothing to do with conservation and education, but profit. As most of the world shifts towards humane and natural eco-tourism, wildlife lovers say the attractions will only diminish Thailand's reputation. (Photo by Barbara Walton/EPA)

Meerkat Manor in an enclosure at the Pretoria Zoo, South Africa, Wednesday, August 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. (Photo by Themba Hadebe/AP Photo)

Young chimpanzee Lazima, born on July 29, lingers with mother Benga in the zoo in Basel, Switzerland, Wednesday, August 13, 2014. (Photo by Keystone, Georgios Kefalas/AP Photo)

Four minipig cubs stand in their compound in the zoo of Hannover, northern Germany, Tuesday, August 12, 2014. They were born in the zoo on July 25. (Photo by Julian Stratenschulte/AP Photo/DPA)