Siberian tigers are seen at the Siberian tiger zoo in Hailin, northeast China's Heilongjiang Province on December 10, 2015. The facility, the world's largest Siberian tigers breeding center, is home to over 1,000 Siberian tigers, among the world's most endangered species. (Photo by Qiang Yong/Xinhua via ZUMA Wire)





A kingfisher flies over at a pond in Shiji Town of Suqian City, east China's Jiangsu Province on December 8, 2015. (Photo by Zhou Haijun/Xinhua via ZUMA Wire)





Ice, a three-year-old female North American cougar, licks its cub at the Royev Ruchey zoo in a suburb of the Siberian city of Krasnoyarsk, Russia, December 8, 2015. Ice and another cougar Arnaldo were both born in the zoo, mated this year and produced two cubs. (Photo by Ilya Naymushin/Reuters)





Ice, a three-year-old female North American cougar, bares teeth as she looks out of her den at the Royev Ruchey zoo in a suburb of the Siberian city of Krasnoyarsk, Russia, December 8, 2015. (Photo by Ilya Naymushin/Reuters)





Ice, a three-year-old female North American cougar, looks out of her den at the Royev Ruchey zoo in a suburb of the Siberian city of Krasnoyarsk, Russia, December 8, 2015. (Photo by Ilya Naymushin/Reuters)





A dog named Blitzen, rescued by Humane Society International (HSI) from a dog meat farm in South Korea, awaits transport to a local shelter in order to be adopted in Washington, December 14, 2015. Twenty-six rescued dogs were divided among five Emergency Placement Partner shelters in the Washington area to find their new homes. HSI is working to reduce the dog meat trade in Asia, including in South Korea where dogs are farmed for the trade. (Photo by Kevin Lamarque/Reuters)





California sea lion Blarney McCresty, that was treated for domoic acid toxicity, is seen during his rehabilitation at the Marine Mammal Center in Sausalito, California in this handout released to Reuters on December 14, 2015 courtesy of The Marine Mammal Center. A neurotoxin produced by marine algae is inflicting brain damage on sea lions along California's coast, causing neurological and behavioral changes that can impair their ability to navigate in the sea and survive in the wild, according to scientists. (Photo by Reuters/The Marine Mammal Center)





Lions Leon and Ronja get affectionate at Usti nad Labem Zoo in Czech Republic on December 12, 2015. (Photo by Slavek Ruta/REX Shutterstock)





Two penguins swim in their pool while others stand outside the water in their enclosure in the zoo in Frankfurt, Germany, Monday, December 7, 2015. (Photo by Michael Probst/AP Photo)





A picture made available on 04 December 2015 shows chimpanzee Robby seen in his enclosure at the 'Belly' circus in Celle, Germany, 03 December 2015. The administrative court in Lueneburg is to decide Robby's future after veterinary authorities did not renew the Zirkushaltung (lit. circus-keeping) permit. (Photo by Julian Stratenschulte/EPA)





Giant panda Meng Meng plays on a tree at a Siberian tiger-breeding base in Changchun, China on December 10, 2015. (Photo by Xu Chang/Xinhua Press/Corbis)





Two infant Chimpanzees play at Taronga Zoo on December 4, 2015 in Sydney, Australia. Taronga's animals were given special Christmas-themed enrichment treats and puzzles designed to challenge and encourage their natural skills. (Photo by Matt King/Getty Images)





A baby seal barks beside a pool as it rehabilitates at the RSPCA Centre at West Hatch on December 9, 2015 in Taunton, England. The Somerset animal sanctuary has had an influx of seals in recent weeks and more have arrived in the past few days after being washed up on beaches in the recent storms. Once spotted, the washed up seals are monitored by various animal rescue charities to insure that they are orphans. Once identified as in need, the seals, who are mainly rescued from beaches in Wales, are brought to the centre to be rehabilitated until such time that they are well and strong enough to be released back into the wild. (Photo by Matt Cardy/Getty Images)





A baby seal looks out from its paddling pool as it rehabilitates in a ward in the animal welfare building at the RSPCA Centre at West Hatch on December 9, 2015 in Taunton, England. (Photo by Matt Cardy/Getty Images)





A Taronga Zoo Giant Tortoise plays with its Christmas treats designed to challenge and encourage the animal's natural skills in Sydney on December 4, 2015. (Photo by William West/AFP Photo)





Meerkats take a rest under a heat lamp on December 11, 2015 at the zoo in Osnabrueck, northern Germany. (Photo by Friso Gentsch/AFP Photo/DPA)





A Boxer, right, and German Shepherd dog participate in the first international tournament in Kuwait for purebred dogs, with participants from Saudi Arabia, Kuwait , Bahrain & Germany in Kuwait City, Saturday, December 12, 2015. (Photo by AP Photo )





Visitors take souvenir photographs of Xing Xing, formerly known as Fu Wa, one of the two giant pandas from China, at the Giant Panda Conservation Center at the National Zoo in Kuala Lumpur, Malaysia, Friday, December 11, 2015. The two giant pandas have been on loan to Malaysia from China for 10 years since May 21, 2014 to mark the 40th anniversary of the establishment of diplomatic ties between the two nations. (Photo by Joshua Paul/AP Photo)





A hawk moves in closer to examine its reflection on the front of a parked car in Maysville, Ky., Thursday, December 10, 2015. (Photo by Terry Prather/The Ledger Independent via AP Photo)





In this Friday, December 11, 2015 file photo, Xing Xing, formerly known as Fu Wa, one of the two giant pandas from China, sniffs for food at the Giant Panda Conservation Center at the National Zoo in Kuala Lumpur, Malaysia. The two giant pandas have been on loan to Malaysia from China for 10 years since May 21, 2014 to mark the 40th anniversary of the establishment of diplomatic ties between the two nations. (Photo by Joshua Paul/AP Photo)