A young female tiger lays in a pen of the Conroe Police Department after being found with leash and collar, wandering a local street, in Conroe, Texas April 21, 2016. (Photo by Reuters/Conroe Police Department)





A spider monkey plays at the zoo in Managua, Nicaragua April 21, 2016. (Photo by Oswaldo Rivas/Reuters)





A white-faced monkey plays on the head of vet Denise Lyons from the U.S. , at the zoo in Managua, Nicaragua April 21, 2016. (Photo by Oswaldo Rivas/Reuters)





German volunteer Katerine Scholz feeds a cappuccino monkey at the National Zoo in Managua, 20 km southeast of the Nicaraguan capital, on April 22, 2016.
Nicaragua's zoo, with over 400 animals of various species, is going through a financial crisis and is having problems to protect and conserve wildlife under their protection, sources said that centre. (Photo by Inti Ocon/AFP Photo)





A white-faced monkey is seen at the zoo in Managua, Nicaragua April 21, 2016. (Photo by Oswaldo Rivas/Reuters)





Volunteer Kristine Scholz feeds a white-faced monkey at the zoo in Managua, Nicaragua April 22, 2016. (Photo by Oswaldo Rivas/Reuters)





A jaguarundi cub (Puma yagouaroundi) is pictured at a zoo in Managua, Nicaragua April 21, 2016. (Photo by Oswaldo Rivas/Reuters)





A picture made available on 17 April 2016 shows a Barbary macaque baby cuddling up to its mother at the Affenberg outdoor enclosure near Salem, Germany, 13 April 2016. The five-day old baby is the first to be born at the enclosure in 2016. The largest monkey park in Germany expects about 15 monkey babies in 2016. (Photo by Felix Kastle/EPA)





Three Lion cubs are presented at the Leningrad city zoo in St. Petersburg, Russia, 22 April 2016. One male (R) and two female lion cubs were born on 15 March. (Photo by Anatoly Maltsev/EPA)





A Tri-colored Heron hatchling opens his mouth at Wakodahatchee Wetlands in Delray Beach, Florida on 21 April 2016. Spring is nesting season in South Florida and over 140 species of birds have been spotted in the wetlands. (Photo by Rhona Wise/AFP Photo)





An undated handout picture made available by Australia's Taronga Zoo on 16 April 2016 shows brush-tailed rock-wallaby Mica and her new joey at Taronga Zoo in Sydney, Australia. The zoo keepers celebrated the unexpected birth of the endangered brush-tailed rock-wallaby joey. (Photo by EPA/Taronga Zoo)





A Siberian tiger at the “Tiergarten Schoenbrunn” zoo in Vienna, Austria, on 19 April 2016. The “Tiergarten Schoenbrunn” zoo, with an area of 17,000 square meters, is part of the Schoenbrunn Palace Gardens and the UNESCO World Heritage Site Schoenbrunn. The oldest zoo in the world is one of the top tourists attractions, with more than two million visitors yearly. (Photo by Christian Bruna/EPA)





Baby Javanese green magpie, left, and an adult magpie, right, sit on a basket at their enclosure in Prague, Czech Republic, Thursday, April 21, 2016. The Javanese green magpie ranks among the most endangered bird species in the world, there are estimated to be between 100 and 250 of them. (Photo by Petr David Josek/AP Photo)





A baby of Javanese green magpies is seen at their enclosure at Prague Zoo, Prague, Czech Republic, 21 April 2016. According Prague Zoo: The Javan green magpie ranks among the most endangered bird species in the world. There are mere 100–250 of them living in the wild. Prague Zoo has become the first European Zoo to succeed in breeding the Javan green magpie. (Photo by Filip Singer/EPA)





In this April 2016 photo provided by the Wildlife Conservation Society, a ring-tailed lemur and her baby sit on a tree branch at the Bronx Zoo in the Bronx borough of New York. The zoo is showing off three baby lemurs. Two are ring-tailed and one is a brown collared lemur. (Photo by Wildlife Conservation Society/Julie Larsen Maher via AP Photo)





In this April 14, 2016 photo provided by the Wildlife Conservation Society, a brown collared lemur clings to its mother at the Bronx Zoo in the Bronx borough of New York. (Photo by Wildlife Conservation Society/Julie Larsen Maher via AP Photo)





Klaas-Jan Huntelaar, forward from German soccer club Schalke 04, feeds the 4.3 meters tall giraffe “Hans” at the zoo in Gelsenkirchen, Germany, Wednesday, April 20, 2016. Huntelaar will become Hans' sponsor. (Photo by Roland Weihrauch/DPA via AP Photo)





Young foxes Fara and Fu play with each others at the wildlife park Eekholt near Grossenaspe, northern Germany, Thursday, April 21, 2016. The two cubs were found motherless in March and were raised by hand in the wildlife park. (Photo by Carsten Rehder/DPA via AP Photo)





A horse belonging to Nevsehir General Commandership of Gendarmerie, is seen in its cage in Nevsehir, Turkey, April 20, 2016. The horses and other animals receive training to intervene at social events and patrol services at areas closed to traffic all around the country. (Photo by Emin Sansar/Anadolu Agency/Getty Images)





Two eaglets watch a bald eagle fly from their nest over the Raccoon River, Monday, April 18, 2016, at Gray's Lake Park in Des Moines, Iowa. (Photo by Charlie Neibergall/AP Photo)





A goose tends to its chicks as they cross a sidewalk near a pond in Salina, Kan., Wednesday, April 20, 2016. (Photo by Tom Dorsey/Salina Journal via AP Photo)





A gaggle of goslings huddle together under the protective wing of a parent along the bank of the Deschutes River as a heavy downpour passes through Bend, Oregon, late Wednesday, April, 20, 2106 afternoon. (Photo by Ryan Brennecke/The Bulletin via AP Photo)





A Bengal tiger shows sign of heat fatigue with its tongue hanging out, the zoo of Karachi, Pakistan, 22 April 2016. (Photo by Shahzaib Akber/EPA)





A worker splashes water on elephants to cool them off, the zoo of Karachi, Pakistan, 22 April 2016. Caretakers at Karachi's zoo were working to keep animals cool during a deadly heatwave affecting southern Pakistan. Large animals, including elephants from Tanzania, white lions, and tigers from Bengalm, have been deeply distressed due to the “unbearable” heat. (Photo by Shahzaib Akber/EPA)





An Indian elephant takes a dust bath amid rising temperatures at Zirakpur Chattbira Zoo some 13kms from Chandigarh on April 18, 2016. (Photo by AFP Photo/Stringer)