A male orangutan kept as a pet protects himself with sack at the owner's home in the village of Korek, in Kubu Raya, Indonesia West Kalimantan province, October 6, 2015 in this picture taken by Antara Foto. Government officials confiscated the orangutan kept as a pet by a resident to relocate it to an orangutan center, local media said on Tuesday. (Photo by Jessica Helena Wuysang/Reuters/Antara Foto)





A chained orangutan who is kept as a pet, holds a plate of food at the owner's home in the village of Korek, in Kubu Raya, Indonesia West Kalimantan province, October 7, 2015 in this picture taken by Antara Foto. (Photo by Jessica Helena Wuysang/Reuters/Antara Foto)





A chained orangutan who is kept as a pet, holds a plate of food at the owner's home in the village of Korek, in Kubu Raya, Indonesia West Kalimantan province, October 7, 2015 in this picture taken by Antara Foto. (Photo by Jessica Helena Wuysang/Reuters/Antara Foto)





Emperor penguins are seen in Dumont d'Urville, Antarctica in this file photo from April 10, 2012. Scientists on October 7, 2015 unveiled the most comprehensive account of the avian family tree ever formulated, detailing how modern bird groups are connected based on genome-wide data from 198 living bird species. They focused in particular on understanding the group called Neoaves, encompassing more than 90 percent of all birds. (Photo by Martin Passingham/Reuters)





A sea lion performs with a Halloween painted ball on its nose during a seasonal event called Aqua Halloween at the Epson Aqua Park Shinagawa in Tokyo, Japan, October 10, 2015. (Photo by Yuya Shino/Reuters)





A young bonobo ape grabs onto its mother at Planckendael's zoo near Mechelen, Belgium, October 10, 2015. (Photo by Francois Lenoir/Reuters)





A boy watches a cheetah walking in his enclosure at Planckendael's zoo near Mechelen, Belgium, October 10, 2015. (Photo by Francois Lenoir/Reuters)





A giraffe calf is pictured among others members of the herd in their enclosure at Planckendael's zoo near Mechelen, Belgium, October 10, 2015. (Photo by Francois Lenoir/Reuters)





Icky (L) and Alana, both Asian elephants, stand in their pen at the Ringling Bros. and Barnum & Bailey Center for Elephant Conservation in Polk City, Florida September 30, 2015. At a Florida retirement home for former circus elephants, residents enjoy a steady diet of high-quality hay and local fruits and vegetables, as well as baths and occasional walks. (Photo by Scott Audette/Reuters)





Sasha Muir and Margaret Davidson sit in a car as some of the 30 barbary macaques, known as the Middle Hill Troop after living between the top of Gibraltar rock and the town, show what happens when motorists forget to lock their luggage compartments, as Scotland’s only monkey drive-through section opens at Blair Drummond safari park in Stirling, Scotland on October 8, 2015. (Photo by Andrew Milligan/PA Wire)





Mike the horse captured on an autumn morning in Yorkshire, England on October 2, 2015 by a local amateur photographer. (Photo by David Zdanowicz/REX Shutterstock)





In this photo taken on Thursday, October 1, 2015, elephants cross the road in Hwange National Park, about 700 kilometres south west of Harare. Fourteen elephants were poisoned by cyanide in Zimbabwe in three separate incidents, two years after poachers killed more than 200 elephants by poisoning, Zimbabwe's National Parks and Wildlife Management Authority said Tuesday, Oct. 6, 2015. (Photo by Tsvangirayi Mukwazhi)/AP Photo)





A Golden Mantled Rosella sits on a branch at the World of Birds wildlife sanctuary in Cape Town, South Africa 06 October 2015. This sanctuary is the largest bird park in Africa with over three thousand birds, monkeys and small animals of four hundred different species in walk through enclosures that attract tens of thousands of international visitors each year. (Photo by Nic Bothma/EPA)





A handout picture made available by Australia's Taronga Zoo shows an orphaned Brushtail Possum joey nicknamed 'Bettina' at Taronga Zoo in Sydney, 06 October 2015. Zoo keeper Felicity Evans has taken on the role of surrogate mother to the four-month-old possum, carrying a makeshift pouch and waking in the middle of the night to bottle feed and toilet the joey. (Photo by EPA/Taronga Zoo)





A black-footed ferret looks out of a crate used to take it to a site to be let loose during a release of 30 of the animals by the U.S. Fish and Wildlife Service, Monday, October 5, 2015, at the Rocky Mountain Arsenal National Wildlife Refuge in Commerce City, Colo. The rare black-footed ferrets were turned loose on the 25-square-mile refuge, which was a former toxic waste site before being reclaimed after a $2.1-billion cleanup. (Photo by David Zalubowski/AP Photo)





An ornate horned frog (Ceratophrys ornata) at the Ueno Zoological Gardens in Tokyo, Japan, October 4, 2015. The Ueno Zoological Gardens is the oldest zoo in Japan. Founded in 1882, it is now home to over 3,000 animals from some 400 different species. (Photo by Franck Robichon/EPA)





One of two European pond turtles si prepared for transport from the Rhinluch nature preserve station in Linum, Germany, 07 October 2015. The turtles are part ofaround 100 animals from the native animal population currently threatened with extinction and are being bred and reared here. Sealife Berlin is taking on found animals not suited for offspring, as they come from other European populations. (Photo by Jens Kalaene/EPA)





This undated handout photograph released by Australia's Museum Victoria on October 6, 2015, shows the hog-nosed rat, a new species of mammal named for its features that scientists said have never been seen before. The creature was found in a remote mountainous area on the island of Sulawesi in central Indonesia, according to Australia's Museum Victoria whose scientists were involved. (Photo by Museum Victoria/AFP Photo)





Four month old snow leopard cubs (Pantheria uncia) explore their habitat as they make their public appearance at the Brookfield Zoo in Brookfield, Illinois, USA, 07 October 2015. The cubs is were born on 16 June 2015. The litter is the second one for Sarani and her 5-year-old mate, Sabu. According to a release, snow leopards are listed as an endangered species by the International Union for Conservation of Nature (IUCN), the world's oldest and largest global environmental organization. A leading snow leopard conservation organization, the Snow Leopard Trust, estimates population numbers of this elusive cat to be between 4,000 and 6,500 remaining in the wild. They are native to the mountain ranges of Central and South Asia. (Photo by Tannen Maury/EPA)





A four month old snow leopard cub (L) (Pantheria uncia) explores its habitat as it makes its public appearance with mother Sarani (R) at the Brookfield Zoo in Brookfield, Illinois, USA, 07 October 2015. The cub is one of two in the litter that was born on 16 June 2015. (Photo by Tannen Maury/EPA)