A brown bear takes a nap after eating one too many salmon in British Columbia, Canada on September 20, 2016. (Photo by Julie Picardi/Barcroft Images)





A caged Javan slow loris, saved from illegal smugglers in North Sumatra, Indonesia on September 21, 2016. Despite an IUCN declaration late last year that the critically endangered primates are one step away from extinction, many are still being illegally traded in markets across the archipelago. (Photo by Albert Damanik/Barcroft Images)





A six-days-old gorilla baby lies in the arms of its mother Shira at the zoo in Frankfurt, Germany, Wednesday, September 21, 2016. (Photo by Michael Probst/AP Photo)





This September 6, 2016 photo provided by Fred Burton at the Cayman Department of the Environment shows a Green Iguana hatchling, right, next to a possible hybrid hatchling, on Grand Cayman Island in the Cayman Islands. Researchers are studying the possible hybrid species that could pose a new risk to a native variety that officials have declared critically endangered, according to the Cayman Department of Environment on Tuesday, Sept. 20, 2016. (Photo by Fred Burton/Cayman Department of the Environment via AP Photo)





A jackal eats a dead animal in front of a vulture in Naboisho Conservancy adjacent to the Masai Mara National Reserve, Kenya September 16, 2016. (Photo by Goran Tomasevic/Reuters)





A leopard sits in a tree in Maasai Mara National Reserve, Kenya September 17, 2016. (Photo by Goran Tomasevic/Reuters)





A jackal eats a dead animal in front of a vulture in Naboisho Conservancy adjacent to the Masai Mara National Reserve, Kenya September 16, 2016. (Photo by Goran Tomasevic/Reuters)





A leopard lies on a tree branch in Maasai Mara National Reserve, Kenya September 17, 2016. (Photo by Goran Tomasevic/Reuters)





An albino zebra walks in Maasai Mara National Reserve, Kenya September 17, 2016. (Photo by Goran Tomasevic/Reuters)





A vulture lands near a dead animal in Naboisho Conservancy adjacent to the Masai Mara National Reserve, Kenya September 16, 2016. (Photo by Goran Tomasevic/Reuters)





A black rhino walks in Maasai Mara National Reserve, Kenya September 17, 2016. (Photo by Goran Tomasevic/Reuters)





Lions rest in Naboisho Conservancy adjacent to the Masai Mara National Reserve, Kenya September 16, 2016. (Photo by Goran Tomasevic/Reuters)





An albino zebra walks in Maasai Mara National Reserve, Kenya September 17, 2016. (Photo by Goran Tomasevic/Reuters)





A baby giraffe runs in Naboisho Conservancy adjacent to the Masai Mara National Reserve, Kenya September 16, 2016. (Photo by Goran Tomasevic/Reuters)





Lionesses play in Naboisho Conservancy adjacent to the Masai Mara National Reserve, Kenya September 16, 2016. (Photo by Goran Tomasevic/Reuters)





A leopard climbs a tree in Maasai Mara National Reserve, Kenya September 17, 2016. (Photo by Goran Tomasevic/Reuters)





Amur leopard or Far Eastern leopard named Kirin, a 7-year-old male born in the Prague Zoo and transported to Krasnoyarsk in August, walks at its new enclosure after a quarantine, at the Royev Ruchey Zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia, September 19, 2016. (Photo by Ilya Naymushin/Reuters)





Amur leopard or Far Eastern leopard named Kirin, a 7-year-old male born in the Prague Zoo and transported to Krasnoyarsk in August, lies at its new enclosure after a quarantine, at the Royev Ruchey Zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia, September 19, 2016. (Photo by Ilya Naymushin/Reuters)





Amur leopard or Far Eastern leopard named Kirin, a 7-year-old male born in the Prague Zoo and transported to Krasnoyarsk in August, is seen at its new enclosure after a quarantine, at the Royev Ruchey Zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia, September 19, 2016. (Photo by Ilya Naymushin/Reuters)





Amur leopard or Far Eastern leopard named Dora, a 2-year-old female species born in the zoo of Tallinn and transported to Krasnoyarsk in August, growls at its new enclosure after a quarantine, at the Royev Ruchey zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia, September 19, 2016. (Photo by Ilya Naymushin/Reuters)





Amur leopard or Far Eastern leopard named Kirin, a 7-year-old male species born in the zoo of Prague and transported to Krasnoyarsk in August, walks at its new enclosure after a quarantine, at the Royev Ruchey zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia, September 19, 2016. (Photo by Ilya Naymushin/Reuters)





Amur leopard or Far Eastern leopard named Dora, a 2-year-old female species born in the zoo of Tallinn and transported to Krasnoyarsk in August, growls at its new enclosure after a quarantine, at the Royev Ruchey zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia, September 19, 2016. (Photo by Ilya Naymushin/Reuters)





Amur leopard or Far Eastern leopard named Kirin, a 7-year-old male species born in the zoo of Prague and transported to Krasnoyarsk in August, grins at its new enclosure after a quarantine, at the Royev Ruchey zoo on the suburbs of the Siberian city of Krasnoyarsk, Russia, September 19, 2016. (Photo by Ilya Naymushin/Reuters)





A monitor lizard swims at a lake at Lumpini park in Bangkok, Thailand, July 11, 2016. Picture taken July 11, 2016. (Photo by Jorge Silva/Reuters)





A crocodile with a used motorcycle tyre around its neck as seen on a river in Palu, Central Sulawesi province, Indonesia September 20, 2016 in this picture taken by Antara Foto. Residents suspect the tyre was garbage thrown into the river before it became trapped around the crocodile's neck, reported Antara. (Photo by Mohamad Hamzah/Reuters/Antara Foto)





Two king penguins and their chick stand in their enclosure in the zoo of Schoenbrunn in Vienna, Austria, September 21, 2016. (Photo by Daniel Zupanc/Reuters/Tiergarten Schoenbrunn)





Two king penguins and their chick stand in their enclosure in the zoo of Schoenbrunn in Vienna, Austria, September 21, 2016. (Photo by Daniel Zupanc/Reuters/Tiergarten Schoenbrunn)





A female hippopotamus named “Mali”, which means Jasmine, eats fruits arranged to look like a cake during her 50th birthday celebration at Dusit Zoo in Bangkok, Thailand September 23, 2016. (Photo by Chaiwat Subprasom/Reuters)





A female hippopotamus named “Mali”, which means Jasmine, walks past children during her 50th birthday celebration at Dusit Zoo in Bangkok, Thailand September 23, 2016. (Photo by Chaiwat Subprasom/Reuters)





A female hippopotamus named “Mali”, which means Jasmine, eats fruits arranged to look like a cake during her 50th birthday celebration at Dusit Zoo in Bangkok, Thailand September 23, 2016. (Photo by Chaiwat Subprasom/Reuters)





A female hippopotamus named “Mali”, which means Jasmine, eats fruits arranged to look like a cake during her 50th birthday celebration at Dusit Zoo in Bangkok, Thailand September 23, 2016. (Photo by Chaiwat Subprasom/Reuters)





A female hippopotamus named “Mali”, which means Jasmine, walks past a sign made with pieces of bread during her 50th birthday celebration at Dusit Zoo in Bangkok, Thailand September 23, 2016. (Photo by Chaiwat Subprasom/Reuters)





A picture available on 20 September 2016 shows a trochilinae bird over a flower in Bucaramanga, Colombia, 19 September 2016. (Photo by Ricardo Maldonado Rozo/EPA)





A stag at Richmond Park on September 22, 2016 in London, England. Today marks the first day of autumn, also known as the autumn equinox, where night and day are equal. (Photo by Jack Taylor/Getty Images)





A white Indian tiger cub plays with its mother at Liberec Zoo in Liberec, Czech Republic on September 20, 2016. (Photo by Slavek Ruta/Rex Features/Shutterstock)





A fawn leaps through the air in Richmond Park on September 22, 2016 in London, England. Today marks the first day of autumn, also known as the autumn equinox, where night and day are equal. (Photo by Jack Taylor/Getty Images)





Photo taken on September 16, 2016 shows seagulls eating chips after stealing them from diners at Bondi Beach in Sydney. The silver gulls, a native Australian species, have become aggressive towards diners at harbourside restaurants and beaches, with diners complaining that the birds snatch food off of their plates whilst they are eating. (Photo by Peter Parks/AFP Photo)





A badger looks for food in a garden shed, Bedfordshire, UK on September 20, 2016. (Photo by Richard Bowler/Rex Features/Shutterstock)





One of the newest additions to the Prague Zoo, an aardvark cub being weighed at Prague ZOO, Czech Republic, September 16, 2016. (Photo by Michal Krumphanzl/CTK via ZUMA Press)





Polar bear Nika eats in her enclosure in a Moscow's Zoo facility outside Moscow, Russia, Tuesday, September 20, 2016. The polar bear rescued by the Russian Defence Ministry in Russia's Far East last week has been settled in the Zoo facility outside Moscow. (Photo by Pavel Golovkin/AP Photo)





A picture available on 20 September 2016 shows a trochilinae bird over a flower in Bucaramanga, Colombia, 19 September 2016. (Photo by Ricardo Maldonado Rozo/EPA)





This undated handout photo received from the Australia Zoo on September 19, 2016 shows Shayne, a nine-month-old orphaned baby koala who has found solace cuddling a fluffy toy koala in the absence of his dead mum, as he recovers from the trauma of her death.
The baby was taken to the Australia Zoo Wildlife Hospital, run by the family of “Crocodile Hunter” Steve Irwin, where doctors said he was overcoming his terrifying ordeal with the help of a toy koala as he learns to be independent. (Photo by Ben Beaden/AFP Photo/Australia Zoo)





Undated handout photo issued by Paignton Zoo of a critically endangered colour-changing lemur leaf frog, which they bred by using artificial rain storms. Issue date: Wednesday September 21, 2016. A team from the zoo prepared a rain chamber using a water pump and timer system to make it rain every few hours during the day. (Photo by Paignton Zoo/PA Wire)





Three rare newborn white tigers with their mother Mandzi are photographed just hours after they were born at the private Zoo Safari in Borysew, Poland, Thursday, September 22 ,2016. The caretakers don't want to disturb the family and have not yet checked how many males and females were born. (Photo by Czarek Sokolowski/AP Photo)





Newborn white lion cubs lie in a private zoo in Borysew near Lodz, Poland September 22, 2016. (Photo by Malgorzata Kujawka/Reuters/Agencja Gazeta)





Newborn white Bengal tiger cub is fed by its mother in a private zoo in Borysew near Lodz, Poland September 22, 2016. (Photo by Malgorzata Kujawka/Reuters/Agencja Gazeta)