Chinese panda Le Bao bites bread, leaning on a birthday cake made with ice in a celebration for his fourth birthday on July 28, at the Everland amusement park in Yongin, South Korea, Sunday, July 10, 2016. A pair of giant pandas arrived in South Korea on March 3, 2016, following an agenda about panda research cooperation in a meeting between Chinese President Xi Jinping and South Korean President Park Geun-hye in 2014. (Photo by Ahnn Young-joon/AP Photo)





A tiger refreshes with a block of ice containing bits of meat in Rome's Bioparco zoo, Wednesday, July, 13, 2016. Zoo staff offered animals frozen and refrigerated food to refresh them as temperatures are expected to rise over the coming days. (Photo by Andrew Medichini/AP Photo)





A lemur licks a block of frozen yogurt and fruit to refresh itself in Rome's Bioparco zoo, Wednesday, July, 13, 2016. (Photo by Andrew Medichini/AP Photo)





A Japanese macaque licks a block of frozen yogurt and fruit to refresh itself in Rome's Bioparco zoo, Wednesday, July, 13, 2016. (Photo by Andrew Medichini/AP Photo)





A black lemur licks a block of frozen yogurt and fruit to refresh itself in Rome's Bioparco zoo, Wednesday, July, 13, 2016. (Photo by Andrew Medichini/AP Photo)





A tiger licks a block of ice containing bits of meat in Rome's Bioparco zoo, Wednesday, July, 13, 2016. (Photo by Andrew Medichini/AP Photo)





A tiger refreshes with a block of ice containing bits of meat in Rome's Bioparco zoo, Wednesday, July, 13, 2016. (Photo by Andrew Medichini/AP Photo)





A monkey is pictured eating a sandwich at the local zoo in Caracas, Venezuela July 12, 2016. (Photo by Carlos Jasso/Reuters)





A performing monkey drinks a bottle of soft drink offered by a man on a road in Colombo, Sri Lanka July 15, 2016. (Photo by Dinuka Liyanawatte/Reuters)





A performing monkey drinks a bottle of soft drink offered by a man on a road in Colombo, Sri Lanka July 15, 2016. (Photo by Dinuka Liyanawatte/Reuters)





This undated handout photo received from Australia Zoo on July 12, 2016 shows a koala named Bowie with different coloured eyes at the zoo, north of Brisbane. With one bright blue eye and one brown, a koala with a rare condition known as heterochromia has dazzled vets in Australia who have named her Bowie after the late singer. The marsupial was recently admitted to the Australia Zoo Wildlife Hospital north of Brisbane after apparently being hit by a car, with vets stunned to find she had different coloured eyes – much like David Bowie's. (Photo by AFP Photo/Australia Zoo)





A five-week-old red ruffed lemur explores its enclosure at Blair Drummond Safari Park in Stirling, Scotland on July 14, 2016. (Photo by Andrew Milligan/PA Wire)





A white-cheeked gibbon plays with a box in its exhibit space at Zoo Miami, Friday, July 15, 2016, in Miami. Zoo Miami unveiled its new $19 million, 1.5 acre entry plaza Friday. (Photo by Wilfredo Lee/AP Photo)





A Tibetan antelope in Hoh Xil, Qinghai, China on July 14, 2016. Over the past decade ecological degradation of the fragile Sanjiangyuan national park eco-system has been curbed through conservation efforts. (Photo by Xinhua/Barcroft Images)





A horse is cooled off by hosing it down at the Derby Week 2016 at the Horner Rennbahn racecourse in Hamburg, Germany, 09 July 2016. (Photo by Daniel Bockwoldt/AFP Photo/DPA)





Wild otter pubs in Tanjong Rhu, Singapore on July 14, 2016. They are called the “Bishan10” because the family has grown from only two otters, spotted for the first time in Singapore’s central area Bishan Park in 2014, to 10 now. The 13th International Otter Congress organised by International Union for Conservation of Nature (IUCN) was held in Singapore for the first time last week. (Photo by Then Chih Wey/Rex Features/Shutterstock)





A mother Bengal tiger and her cubs at Ranthambore tiger reserve in Rajasthan, India on July 14, 2016. Having made a kill the day before, the mum and her well-fed youngsters were in good spirits – even taking time out to go for a quick swim. (Photo by Andy Rouse/Barcroft Images)





Lemurs wait in anticipation as they are treated with special cake during the celebration of the 45th birthday of Zoo Apenheul in Apeldoorn, The Netherlands, 12 July 2016. (Photo by Remko De Waal/EPA)





An oriental small-clawed otter rubs its chin in an animal enclosure at Berlin zoo in Berlin, Germany, 9 July 2016. (Photo by Maurizio Gambarini/DPA via ZUMA Press)





Three-year-old female elephant Ancharli scratches herself using a tree trunk in her enclosure at the zoo in Berlin, Germany, 09 July 2016. (Photo by Maurizio Gambarini/DPA via ZUMA Press)





The newborn Bornean orangutan pictured with her mother Surya at Madrid zoo, Spain on July 11, 2016. (Photo by Jorge Sanz/Pacific Press via ZUMA Wire)





Three baby seals swim in a pool of the seal breeding station in Friedrichskoog, northern Germany, on July 11, 2016. The station close to the North Sea cares for abandoned seal pups that were separated from their mothers. (Photo by Axel Heimken/AFP Photo/DPA)





A Japanese macaque eats fruit at the Bioparco, a zoo in Rome, to cool off in the searing heat, on July 13, 2016. (Photo by Tiziana Fabi/AFP Photo)





In this photograph taken on June 2, 2016, a rescued male rhino calf is fed a bottle of milk by an Indian animalkeeper at The Centre for Wildlife Rehabilitation and Conservation facility in Kaziranga National Park, some 250kms east of Guwahati. As night falls over the lush plains of India's Kaziranga national park, a small group of lightly armed forest guards sets out on foot to protect the world's largest population of one-horned rhinos. These men with their ageing rifles and small plastic torches are on the front line of the battle against increasingly sophisticated international poaching networks that prey on the rare animals, entering the park under cover of darkness to kill them for their horns. (Photo by Biju Boro/AFP Photo)





Zoo owner Manny Tangco feeds two tiger cubs named “Tiger Duterte” and “Tiger Leni”, after Philippine President Rodrigo Duterte and Vice President Leni Robredo, at the Malabon Zoo in Manila on July 14, 2016. Tangco said he named the two tiger cubs hoping the Philippine ecomony will become a “Tiger Economy”. (Photo by Noel Celis/AFP Photo)





Bengal tiger “Cory” tries to lick her cub “Tiger Duterte” from behind the glass cage as its presented to the media by Malabon Zoo owner Manny Tangco Thursday, July 14, 2016 at Malabon city north of Manila, Philippines. “Tiger Duterte” and another cub “Tiger Leni”, both two months old, are named after the country's new president and vice-president respectively and are the offsprings of “Tiger Cory” and “Tiger Ninoy”, named after the parents of former President Benigno Aquino III. (Photo by Bullit Marquez/AP Photo)





A Bengal tiger licks a glass enclosure during a presentation of Bengial tiger cubs at the Malabon Zoo in Malabon City, north of Manila, Philippines, 14 July 2016. The Bengal tiger cubs, which were born at the zoo, are two months old and named “Tiger Duterte” and “Tiger Leni”. The Malabon Zoo has one of the largest private collections of exotic and endemic animals in the Philippines. (Photo by Mark R. Cristino/EPA)





Malabon Zoo owner Manny Tangco talks on his cellphone as Bengal tiger “Ninoy” opens his mouth Thursday, July 14, 2016 at Malabon city, north of Manila, Philippines. (Photo by Bullit Marquez/AP Photo)





Baby elephant Anjuli celebrates 1st birthday at Hagenbeck Zoo in Hamburg, Germany on July 13, 2016. (Photo by Stephan Wallocha/Startraksphoto.com)





Chevy, front right, pulls to the front of the pack to win the Rescue the Animals Dachshund Races on Thursday, July 14, 2016, at the Nelson Park Festival Gardens in Abilene, Texas. (Photo by Tommy Metthe/Abilene Reporter-News via AP Photo)





A Sumatran orangutan named Mango looks out from his habitat at Zoo Miami, Friday, July 15, 2016, in Miami. Zoo Miami unveiled its new $19 million, 1.5 acre entry plaza Friday. (Photo by Wilfredo Lee/AP Photo)





Monkeys are treated with special cake during the celebration of the 45th birthday of Zoo Apenheul in Apeldoorn, The Netherlands, 12 July 2016. (Photo by Remko De Waal/EPA)