A wild obese macaque named “Uncle Fat”, who was rescued from a Bangkok suburb, sits with bananas in a rehabilitation center in Bangkok, Thailand, Friday, May 19, 2017. The morbidly obese wild monkey, who gorged himself on junk food and soda from tourists, has been rescued and placed on a strict diet. (Photo by Sakchai Lalit/AP Photo)





Kentucky Derby winner Always Dreaming stands outside his barn at Pimlico Race Course in Baltimore, Monday, May 15, 2017. The Preakness Stakes horse race is scheduled to take place May 20. (Photo by Patrick Semansky/AP Photo)





This undated US National Park Service handout photo obtained May 16, 2017 shows an Alpha female white wolf of the Canyon pack in Yellowstone National Park in Montana A conservation group on Monday more than doubled a reward for information on who was behind last month' s shooting of a rare white wolf at Yellowstone National Park .The severely injured female wolf dubbed “White Lady” was found by hikers on April 11, 2017 near Gardiner, Montana, and had to be euthanized. Park officials last week offered a reward of up to $5,000 for information on who shot the animal described as "one of the most recognizable wolves and sought after by visitors to view and photograph. (Photo by Neal Herbert/AFP Photo/US National Park Service)





Javan Gibbon “Owa Jawa” (Hylobates moloch) seen after release at Tilu Mountain on May 17, 2017 in West Java, Indonesia. Owa Jawa are endemic animals of West Java. Based on the latest census data it is known that the population of 'Owa Jawa' in the nature ranges from 2.140 to 5.310 tail with high extinction threat level. The population of 'Java Owa' continues to decrease annually due to forest destruction and poaching activities. In addition, the nature of Java's monogamous Javanese monastery and giving birth to just one baby every three years is increasingly threatening. (Photo by Jefta Images/Barcroft Images)





A great crested grebe carries a chick on its back in Blackwall Basin, London, UK on May 16, 2017. (Photo by Victoria Jones/PA Wire)





A picture taken on May 12, 2017 shows a chick of sooty gull on the Emirati island of Sir Bu Nair, in the Gulf. .The Island is a nature reserve and home to the endangered Hawksbill sea turtle, and colonies of birds, such as the Sooty gull and the Bridled tern, who nest and live on the island alongside gazelles and hedgehogs. (Photo by Karim Sahib/AFP Photo)





A giant panda plays in a rocking chair at Beijing Zoo on May 17, 2017 in Beijing, China. (Photo by VCG/VCG via Getty Images)





In this Friday, May 12, 2017, photo, Ann Edie, who has been blind since birth, walks with her miniature guide horse Panda on a street near her home in suburban Albany, N.Y. Retired teacher Edie and her husband drained more than $30,000 from their retirement nest egg to get Panda a life-saving operation after she suffered a serious intestinal blockage. Horse lovers who follow a blog about Panda’s training have also kicked in more than $11,000 to help defray costs. (Photo by Mary Esch/AP Photo)





A newborn white Siberian tiger cub yawns in its enclosure at San Jorge zoo in Ciudad Juarez, Mexico, May 15, 2017. (Photo by Jose Luis Gonzalez/Reuters)





A newborn white Siberian tiger cub is pictured next to its mother in their enclosure at San Jorge zoo in Ciudad Juarez, Mexico, May 15, 2017. (Photo by Jose Luis Gonzalez/Reuters)





A newborn white Siberian tiger cub is pictured in its enclosure at San Jorge zoo in Ciudad Juarez, Mexico, May 15, 2017. (Photo by Jose Luis Gonzalez/Reuters)





Newborn white Siberian tiger cubs are presented to the media at San Jorge zoo in Ciudad Juarez, Mexico, May 16, 2017. (Photo by Jose Luis Gonzalez/Reuters)





Animal trainers Hans and Mary Klose pose with their animals for a portrait before taking part in the last weekend of the Ringling Bros. and Barnum & Bailey circus at Nassau Coliseum in Uniondale, New York, May 19, 2017. (Photo by Lucas Jackson/Reuters)





A stork family sits on their nest in Biebesheim am Rhein, western Germany, on May 16, 2017. (Photo by Boris Roessler/AFP Photo/DPA)





A cat dressed in a collar and tie looks out from a window of the Ecuadorian embassy in London, Friday May 19, 2017. Sweden's top prosecutor says she is dropping an investigation into a rape claim against WikiLeaks founder Julian Assange after almost seven years. (Photo by Matt Dunham/AP Photo)





A picure made availiable on 14 May shows a jackdaw (Corvus monedula) perching on a twig in the rain near Tiszaalpar, 118 kms southeast of Budapest, Hungary, 12 May 2017. (Photo by Attila Kovacs/EPA)





Carp have their mouths open as they swim in a small lake in a park in Frankfurt, Germany, Monday, May 15, 2017. (Photo by Michael Probst/AP Photo)





A monkey leaps into a pond on a hot day in Allahabad on May 19, 2017. According to local reports temperatures have soared in the northern Indian city to 47.28 Celsius. (Photo by Sanjay Kanojia/AFP Photo)





A monkey leaps along the branches of a tree in a pond on a hot day in Allahabad on May 19, 2017. (Photo by Sanjay Kanojia/AFP Photo)





A monkey leaps into a pond on a hot day in Allahabad on May 19, 2017. (Photo by Sanjay Kanojia/AFP Photo)





Three young storks beg for food as they sit on their nest in Biebesheim am Rhein, western Germany, on May 16, 2017. (Photo by Boris Roessler/AFP Photo/DPA)





An Indian tiger rests in a pool of water amid rising temperatures at Alipore Zoological Gardens in Kolkata on May 16, 2017. (Photo by Dibyangshu Sarkar/AFP Photo)