A baby orangutan lies in a plastic crate, after it was seized from a wildlife trafficking syndicate, at a police office in Pekanbaru, Riau province, in this November 9, 2015 picture taken by Antara Foto. According to local media, police investigators arrested individuals from a wildlife trafficking syndicate who were attempting to smuggle out three orangutan babies, ranging between 6 to 12 months of age, from their forest in Aceh with the intention of selling them to buyers in Pekanbaru for the price of Rp25 million per orangutan. (Photo by F.B. Anggoro/Reuters/Antara Foto)





A police investigator carries a baby orangutan, after it was seized from a wildlife trafficking syndicate, at a police office in Pekanbaru, Riau province, in this November 9, 2015 picture taken by Antara Foto. (Photo by F.B. Anggoro/Reuters/Antara Foto)





A young Sumatran orangutan looks out from its travel cage as it arrives at the Sumatran Orangutan Conservation Programme quarantine at Batu Mbelin, near Medan in North Sumatra, Indonesia November 16, 2015. Three baby Sumatran orangutan were recovered recently by police after they arrested wildlife traffickers who smuggled them out of Aceh province. (Photo by Y.T. Haryono/Reuters)





Staff at the Sumatran Orangutan Conservation Programme carry three baby orangutans before being placed in quarantine at Batu Mbelin, near Medan in North Sumatra, Indonesia on November 16, 2015. (Photo by Y.T. Haryono/Reuters)





A zoo employee carries three-month-old female giant panda cub, born to mother Liang Liang and father Xing Xing, on display to the public for the first time at the national zoo in Kuala Lumpur, Malaysia, November 17, 2015. (Photo by Olivia Harris/Reuters)





A 3-month old female giant panda cub, bottom left, is displayed for the first time at the Giant Panda Conservation Center at the National Zoo in Kuala Lumpur, Malaysia, Tuesday, November 17, 2015. (Photo by Joshua Paul/AP Photo)





A black bear is pictured with its head stuck in a milk can near Thurmont, Maryland in this November 16, 2015 handout photo. Maryland Department of Natural Resource workers tranquilized the bear before using and electric hand saw to cut the milk can off. The bear recovered consciousness and walked off unharmed. (Photo by Reuters/Maryland Wildlife and Heritage Service)





A giant panda named Huajiao climbs the bars on a cage at the China Conservation and Research Centre for the Giant Panda, in Wolong, Sichuan province, November 17, 2015. The centre is preparing the two-and-a-half-year old giant panda to be released to the wild, according to local media. (Photo by Reuters/China Daily)





A monkey is reflected on a pond while drinking water at Swayambhunath stupa, also know as Monkey Temple, in Kathmandu, Nepal November 18, 2015. The letters in the background reads, "May peace prevail on earth". (Photo by Navesh Chitrakar/Reuters)





A pig is seen at a park in Mexico City on October 15, 2015. At first glance they might seem like small pudgy dogs, but they are really mini pigs being walked, the latest pet fashion and status symbol in Mexico City. (Photo by Ronaldo Schemidt/AFP Photo)





An elegant hippo raises a leg in the air in St Lucia, South Africa, on November 18, 2015. (Photo by Jan Hrbacek/Barcroft Media)





A squirrel carries a walnut in its mouth on a tree in Fuerstenwalde, Germany, 14 November 2015. (Photo by Patrick Pleul/EPA)





Baby chimpanzee Jason sits on his sleeping box at the Attica Zoological Park in Spata, east of Athens, Friday, November 13, 2015. Jason, who is nearly three months old, is being tended and bottle-fed by zoo staff, as his mother fell sick while he was days old and has been unable to feed him. He will be brought up separately from the zoo's other eight chimpanzees for about a year and a half, and then gradually reintroduced in a painstaking process aiming at his full acceptance by the group and integration. (Photo by Thanassis Stavrakis/AP Photo)





Baby chimpanzee Jason clings to zookeeper Alicia Hoogenboom from the Netherlands at the Attica Zoological Park in Spata, east of Athens, Friday, November 13, 2015. Jason, who is nearly three months old, is being tended and bottle-fed by zoo staff, as his mother fell sick while he was days old and has been unable to feed him. He will be brought up separately from the zoo's other eight chimpanzees for about a year and a half, and then gradually reintroduced in a painstaking process aiming at his full acceptance by the group and integration. (Photo by Thanassis Stavrakis/AP Photo)





Owls are spotted sitting in hollow nest in Patan, Nepal, November 18, 2015. (Photo by Narendra Shrestha/EPA)





Burrowing owls at the side of the track during practice for the Formula One Grand Prix of Brazil at Autodromo Jose Carlos Pace on November 13, 2015 in Sao Paulo, Brazil. (Photo by Clive Mason/Getty Images)





In this image released by the Columbus Zoo and Aquarium , a polar bear cub is tended to at the Columbus Zoo, Friday, November 13, 2015, in Powell, Ohio. The central Ohio zoo said Friday that staff started hand-rearing the week-old female cub after her mother, Aurora, began taking breaks from caring for her. The cub was born on Nov. 6. (Photo by Grahm S. Jones/Columbus Zoo and Aquarium via AP Photo)