This file photo taken on October 20, 2017 shows Jonathan, a Seychelles giant tortoise, believed to be the oldest reptile living on earth with and alleged age of 185 years, crawling through the lawn of the Plantation House, the United Kingdom Governor official residence in Saint Helena, a British Overseas Territory in the South Atlantic Ocean. (Photo by Gianluigi Guercia/AFP Photo)





A Slow lorises (Nycticebus coucang) is seen in a cage after the Citizens surrender to the Nature Conservation Agency officer on November 28, 2017 in Pekanbaru, Indonesia. The Slow lorises in Indonesia is in serious danger of extinction and the greatest threat to its survival is the illegal trade in wildlife. (Photo by Afrianto Silalahi/Barcroft Media)





Tori, a two- year- old male Siberian tiger, also known as Amur or Ussuri tiger, growls in its enclosure at a zoo in Tbilisi on November 27, 2017. (Photo by Vano Shlamov/AFP Photo)





White-throated kingfisher (Halcyon smyrnensis) bird eats snake in a field near the West Bank city of Nablus, 27 November 2017. (Photo by Alaa Badarneh/EPA/EFE)





A deer with parts of a hammock stuck in its antlers, Prince Rupert, British Columbia, Canada on November 27, 2017. (Photo by Kristy Yaschuk via Reuters)





A baby Sumatran elephant (elephas maximus sumatranus) seen playing with her mother at Elephant Flying Squad Camp, Tesso Nilo National Park on November 23, 2017 in Riau, Indonesia. The elephant baby named Harmoni Rimbo was born on November 21, 2017, which is the result of marriage between wild elephant with tame female elephant Flying Squad WWF and Riau Natural Resource Conservation Center (BBKSDA). Indonesia's endangered elephants are threatened by shrinking habitat due to deforestation. Only 3,000 Sumatran elephants are believed to remain in the wild. (Photo by Jefta Images/Barcroft Images)





A picture shows a dried up reservoir in drought- stricken Buendia on November 24, 2017 Spain and Portugal are grappling with a devastating drought which has left rivers nearly dry, sparked deadly wildfires and devastated crops – and experts warn that prolonged dry spells will become more frequent. (Photo by Pierre-Philippe Marcou/AFP Photo)





A bighorn sheep makes its way down a rock wall on November 27, 2017 near Banff, Alberta. (Photo by Don Emmert/AFP Photo)





Lion cubs seen playing under the early light of the northern foothills of the Serengeti, at Masai Mara on November 24, 2017 in Kenya. The warming sunbeams also awakened the spirits of the lions. Especially two lion cubs. Both lion cubs were around 8 weeks old. The male cub looked rather calm and awkward, while his sister was very lively and started to fight with his brother. Good-naturedly, the older man read everything about himself. Biting attacks, threatening gestures, blows with the front paw did not disturb him. The skirmish lasted for about ten minutes, accompanied by small, high-pitched cries from the lion girl. Gadgets of this kind are part of the development of the lion's offspring. Only then can they assert themselves in the pack and find their rank in the group. Ingo Gerlach, German Wildlife Photographer, 64, was delighted with these outstanding scenes. (Photo by Ingo Gerlach/Barcroft Media)





Chimpanzee Ai looks at visitors during a cognitive test at the Primate Research Institute of Kyoto University in Inuyama, Aichi Prefecture, central Japan, 29 November 2017 (issued 30 November 2017). The institute, established in 1967 to serve as a center for primate research in Japan, is marking its 50th anniversary this year. The research work 'Ai-project,' started in 1978 by Dr Tetsuro Matsuzawa, Primatologist and Distinguished Professor with the Kyoto University Institute for Advanced Study (KUIAS, Comparative Cognitive Science), aims at understanding chimpanzee cognition to know the evolutionary origins of the human mind. The research program studies the cognitive skills, through computer interface experiments, of female chimpanzee Ai, since her birth in 1977, and later her son Ayumu, who was born in 2000, at the Primate Research Institute of Kyoto University (KUPRI). The research has demonstrated that chimps have remarkable levels of intelligence showing a superior short term memory than humans. (Photo by Kimimasa Mayama/EPA/EFE)





Indian villagers look on as a herd of 46 wild elephants walk through the Gangaram Tea Garden, some 38 km from Siliguri on November 29, 2017. Asian elephants are listed as endangered animals. As the human population increases the natural habitat of the elephants get destroyed and they are forced to move in farming areas where causing damage to crops. (Photo by Diptendu Dutta/AFP Photo)





A dog reacts as he awaits the competition during the “Zagreb Winter Classic” dog show in Zagreb, Croatia on November 26, 2017. (Photo by Antonio Bronic/Reuters)





Newborn white Bengal tiger cubs are shown to the media at San Jorge zoo in Ciudad Juarez, Mexico, November 28, 2017. (Photo by Jose Luis Gonzalez/Reuters)





A white bronze turkey is seen amongst Norfolk black turkeys hatched in June and raised free range for Christmas are seen ready for market on David McEvoy's Turkey farm in Termonfeckin, Ireland, November 26, 2017. (Photo by Clodagh Kilcoyne/Reuters)





Tourists photograph a red dear stag visiting a car park near Glen Coe on December 1, 2017 in Glen Coe,Scotland. On the first day of the meteorological calendar, the UK was experiencing slightly warmer temperatures today with weather forecasters indicating that the recent cold spell is almost over. Yesterday's snow across eastern parts of England is expected to melt away over the course Friday as temperatures start to rise. (Photo by Jeff J. Mitchell/Getty Images)