Deer roam through bluebells in Micheldever Wood, Hampshire, England on April 25, 2017 as the blast of Arctic weather that has brought snow to northern Scotland continues to move south. (Photo by Victoria Jones/PA Wire)





Since 2009, staff at Wildlife Conservation Society's Bronx Zoo have been working behind the scenes to save the Eastern hellbender. Now, this elusive salamander can be seen in a new exhibit in the zoo's historic Reptile House beginning April 26, 2017. The Eastern hellbender is a large species of salamander native to freshwater rivers and streams in Eastern North America. New York State lists the hellbender as a species of Special Concern. Populations are declining due to several factors including over chytrid fungus, water pollution, and habitat destruction. (Photo by UPI/Barcroft Images





A two-week-old pygmy hippopotamus (Choeropsis liberiensis) rests in the hippopotamus enclosure in Nyiregyhaza Animal Park in Nyiregyhaza, 227 kms east of Budapest, Hungary, Tuesday, April 25, 2017. (Photo by Attila Balazs/MTI via AP Photo)





A white tiger swims in a creek to cool itself on a hot summer day at Anna National Zoological Park in Chennai on April 26, 2017. (Photo by Arun Sankar/AFP Photo)





A female purple Sunbird sucks nectar from a flower at a garden in Allahabad, India, Wednesday, April 26, 2017. (Photo by Rajesh Kumar Singh/AP Photo)





A new born red ruffed lemur hangs in a net in the Cologne Zoo, in Cologne, Germany, 27 April 2017. Two black-and-white ruffed lemurs and one red ruffed lemur were born on 31 March and 01 April 2017. (Photo by Sascha Steinbach/EPA)





A new born black-and-white ruffed lemur hangs on a rope in the Cologne Zoo, in Cologne, Germany, 27 April 2017. (Photo by Sascha Steinbach/EPA)





In this Thursday, April 13, 2017, photo, a wild boar walks in a swamp, in Slidell, La. Feral hogs are believed to cause $76 million or more in damage across the state every year but in recent years a small Louisiana slaughterhouse has begun butchering the hogs and selling the product to grocery stores and restaurants as part of an effort to help control the hogs' numbers. (Photo by Rebecca Santana/AP Photo)





This hand out picture taken by John B. Weller and released by the Pew Charitable Trusts on April 25, 2017 shows penguins seen in Antartica. Scientists on April 25, 2017 urged more protections in the pristine Antarctic wilderness to help halt species decline, with climate change and overfishing taking its toll. The call, coinciding with World Penguin Day, created to promote the iconic waddling seabirds' health and conservation, builds on a landmark agreement reached in Australia last October to create the world' s largest marine reserve. (Photo by John B. Weller/AFP Photo/The Pew Charitable Truts)





A White Bengal tiger cub is pictured at the White Zoo in Kernhof, lower Austria, 26 April 2017. The tiger babies were born on 22 March. The two male ones are called Falco and Toto, the female ones are named Mia and Mautzi. (Photo by Lisi Niesner/EPA)





School of Remora (Echeneis naucrates) and Bignose Unicornfish (Naso vlamingii) under surface of the water on April 23, 2017 in Indian Ocean, Maldives. (Photo by Andrey Nekrasov/Barcroft Media)





Bats are seen in the Old City in Caesarea, Israel, April 26, 2017. (Photo by Amir Cohen/Reuters)





“Shanker” a Bengal Tiger reacts as an Indian animalkeeper uses a hose to sprinkle water to cool him in a special enclosure at The Nehru Zoological Park in Hyderabad on April 21, 2017, during an intense heatwave in the southern Indian state of Telangana. With temperatures currently hovering around the 40 degree celsius mark in the state, zoo authorities have installed air coolers, sprinklers, green mesh sheets and wet gunny sheets to make the animals more comfortable. (Photo by Noah Seelam/AFP Photo)





Aurora, a seven-year-old female polar bear, jumps into a swimming pool which was recently filled with water after the winter season, at the Royev Ruchey zoo in a suburb of the Siberian city of Krasnoyarsk, Russia, April 24, 2017. (Photo by Ilya Naymushin/Reuters)





A hippopotamus is sprayed with water on a hot summer day at Anna National Zoological Park in Chennai, India on April 26, 2017. (Photo by Arun Sankar/AFP Photo)





A critically endangered white-cheeked gibbon clings to its mother at Twycross Zoo in Atherstone, England, Tuesday April 25, 2017. The one week old offspring is the first northern white-cheeked gibbon to be born in Europe this year. (Photo by Joe Giddens/PA Wire via AP Photo)





A mallard duck enjoys a piece of bread along 3rd Ave., in Johnstown, Pa. Monday, April 24, 2017. (Photo by Todd Berkey/The Tribune-Democrat via AP Photo)