An Indian one-horned rhinocero and its baby walk at the Pobitora Wildlife Sanctuary in the Morigaon district of the northeastern state of Assam on May 11, 2019. Pobitora Wildlife Sanctuary has the highest concentration of Indian rhinos in the world. (Photo by Biju Boro/AFP Photo)





A wild chimpanzee eats a tortoise, scooping out the meat after cracking the hard shell against a tree trunk, at the Loango national park on the coast of Gabon, in this photo provided by the Max Planck Institute. Researchers from the institute and the University of Osnabrück said they had spotted the unusual behaviour dozens of times in a group of chimpanzees. (Photo by Erwan Theleste/AP Photo)





One of 24 goats released into New York's Riverside Park as “summer interns” to roam a fenced, sloped, two-acre area feasts on invasive plant species as part of the Riverside Park Conservancy's “GOaTHAM” initiative in the Manhattan borough of New York City, U.S., May 21, 2019. (Photo by Mike Segar/Reuters)





A ground squirrel is seen in field in Turkistan province in Kazakhstan on May 14, 2019. (Photo by Ozgun Tiran/Anadolu Agency/Getty Images)





A spotted owlet, small owl breeding in tropical Asia, looks on as it sits on a tree branch in Kathmandu on May 17, 2019. (Photo by Prakash Mathema/AFP Photo)





A conservation agency official feeds a critically endangered Eurasian otter after it was confiscated from smugglers in Denpasar, Bali, Indonesia on May 20, 2019. (Photo by Nyoman Budhiana/Antara Foto via Reuters)





A baby giraffe, born a month ago, named Gema, is seen during a presentation to the media and public at Buin Zoo, on the outskirts of Santiago, Chile, May 17, 2019. (Photo by Pablo Sanhueza/Reuters)





Walrus Polosa and her unnamed calf, born on May 5 in the Hagenbeck Zoo, dive in their compound as they are presented to the public in Hamburg, Germany May 23, 2019. (Photo by Fabian Bimmer/Reuters)





The female walrus Polosa and her young offspring swim in a pool in the Arctic Ocean in Hagenbeck Zoo in Hamburg on May 23, 2019. The 23-year-old walrus lady gave birth to the little walrus bull on 5 May and was on her way with her boy for the first time on Thursday in the water basin of the Arctic Sea facility. (Photo by Christian Charisius/dpa)





A dead gray whale rests on Limantour Beach at Point Reyes National Seashore in Point Reyes Station, north of San Francisco, California, U.S., May 23, 2019. (Photo by Stephen Lam/Reuters)





Waves crash on the carcass of a dead gray whale on Limantour Beach at Point Reyes National Seashore in Point Reyes Station, north of San Francisco, California, U.S., May 23, 2019. (Photo by Stephen Lam/Reuters)





In this May 8, 2019, photo, a pig stands between other pigs in a barn at a pig farm in Jiangjiaqiao village in northern China's Hebei province. Pork lovers worldwide are wincing at prices that have jumped by up to 40 percent as China's struggle to stamp out African swine fever in its vast pig herds sends shockwaves through global meat markets. (Photo by Mark Schiefelbein/AP Photo)





In this Friday, May 10, 2019 photo, Pedro, a 45-year-old white rhinoceros eats a baguette for breakfast together with a peacock and pigeons in his enclosure at the zoo in Barcelona, Spain. Animal rights activists in Barcelona are celebrating a victory after the Spanish city ordered its municipal zoo to restrict the breeding of captive animals unless their young are destined to be reintroduced into the wild. (Photo by Renata Brito/AP Photo)





A pair of red wolves huddle at the Museum of Life and Science in Durham, N.C., on Monday, May 13, 2019. With less than three dozen roaming the forests of North Carolina, the red wolf has seen its numbers crash in recent years, putting it in the most precarious position of any wolf species in the U.S. (Photo by Gerry Broome/AP Photo)





A 7-week-old Mexican gray wolf pup explores its surroundings at the Endangered Wolf Center Monday, May 20, 2019, in Eureka, Mo. The Mexican gray wolf recovery team hopes to double the number in the wild over several years. (Photo by Jeff Roberson/AP Photo)





War of Will is washed after exercising in preparation of the Preakness Stakes, Thursday, May 16, 2019, at Pimlico Race Course in Baltimore. The horse race is scheduled to take place Saturday, May 18. (Photo by Will Newton/AP Photo)





A little lion roars beside its mother at the zoo in Erfurt, Germany, Thursday, May 23, 2019. (Photo by Martin Schutt/dpa via AP Photo)





Five small goslings float over the river Main in Frankfurt, Germany, on a warm and sunny Friday, May 24, 2019. (Photo by Michael Probst/AP Photo)





Rummaging in a bin for scraps, this fox in Barnet, north London, England found itself trapped in the lid on May 23, 2019. Luckily the Royal Society for the Prevention of Cruelty to Animals were able to free it. (Photo by RSPCA/PA Wire Press Association)