A bald eagle carrying a branch lands in its nest atop a tree overlooking the Raccoon River, Monday, April 30, 2018, at Gray's Lake Park in Des Moines, Iowa. (Photo by Charlie Neibergall/AP Photo)





A fox in the Rostovsky nature reserve in Orlovsky District, by the shores of Lake Manych-Gudilo, Rostov-On-Don Region, Russia on April 25, 2018. (Photo by Valery Matytsin/TASS via Getty Images)





A black rhino runs around in a holding pen in Zakouma National Park on May 4, 2018. The black rhino has been considered officially extinct in the country of Chad since the 1990’s but due to an institutional cross- country collaboration between the Chadian and South African governments the black rhinoceros has returned to the country. Through a collaboration between conservation organization African Parks and South African National Parks, six rhinos where flown cross continent to be reintroduced to Zakouma National Park in Chad. (Photo by Stefan Heunis/AFP Photo)





An Andean bear baby looks around as it enters first time its outdoor enclosure in the zoo in Frankfurt, Germany, Monday, April 23, 2018. (Photo by Michael Probst/AP Photo)





A baby otter has its first health checkup at Chester zoo, England on May 2, 2018. It was among five pups being weighed and microchipped. (Photo by Peter Byrne/PA Wire)





An undated handout photo made available by Everland on 24 April 2018 shows a pair of male and female baby cheetahs born on 13 March at the Everland amusement park in Yongin, South Korea. (Photo by EPA/EFE)





In this photograph taken on April 30, 2018, Sri Lankan passersby feed fruits to an elephant along the Kataragama- Buttala road in Kataragama. (Photo by Ishara S. Kodikara/AFP Photo)





Veterinarians of Four Paws animals welfare charity, check May, a female moon bear, during her rescue from a bear farm for bile trading to a bear sanctuary, an animal welfare project by Four Paws in Ninh Binh province, Vietnam April 26, 2018. (Photo by Reuters/Kham)





A black grouse performs courtship rituals on a field near the village of Lovchitsy, some 65 km northwest of Minsk, on May 3, 2018. (Photo by Maxim Malinovsky/AFP Photo)





A bear crouches in a tree in a suburban area of Paramus, N.J., Monday, April 30, 2018. Authorities are waiting for the bear to come down from the tree before trying to move it to a less populated area. (Photo by Seth Wenig/AP Photo)





A bear rests in a tree in a suburban area of Paramus, N.J., Monday, April 30, 2018. (Photo by Seth Wenig/AP Photo)





A bear rests in a tree in a suburban area of Paramus, N.J., Monday, April 30, 2018. (Photo by Seth Wenig/AP Photo)





A woman looks up at a bear resting in a tree over her house in Paramus, N.J., Monday, April 30, 2018. (Photo by Seth Wenig/AP Photo)





An African penguin (R) interacts with a Cape Cormorant (L) on Boulders Beach in Cape Town, South Africa 20 April 2018. The Western Cape Local Government and the South African Environmental Affairs Department says it has recorded 18 abnormal penguin deaths with four of these cases confirmed as avian influenza through testing since late January at Boulders Beach. The African Penguin is listed as endangered on the International Union for Conservation of Nature (IUCN) Red List with the numbers steadily declining in the last 100 years. The Boulders population is numbered at 1,700. Officials have warned the public to refrain from handling any species of dead birds in their gardens and the beaches. (Photo by Nic Bothma/EPA/EFE)





A picture shows three bear cubs who were found by the Bulgarian authorities in the wild and rescued at the Dancing Bears Park near Belitsa, Bulgaria, April 22, 2018. The cubs, who are about 3 months old, will be relocated in the next days to a bear orphan station in Greece. (Photo by Hristo Vladev/Reuters/Four Paws)





A nightingale sings a song on a tree brunch in a park in Minsk, Belarus May 2, 2018. (Photo by Vasily Fedosenko/Reuters)





A farmer shows his newborn pet guinea pigs in Santo Domingo, Cuba, March 31, 2018. (Photo by Alexandre Meneghini/Reuters)





A peacock displays his plumage as part of a courtship ritual to attract a mate, at a park in London, Britain, May 4, 2018. (Photo by Toby Melville/Reuters)





In this April 6, 2018, photo, Winsol, an aardvark born in December, above, rests alongside his mother Ali at the Cincinnati Zoo & Botanical Garden in Cincinnati. The zoo has been collecting and sending milk samples from Ali to the Smithsonian's National Zoo and the Smithsonian's Exotic Animal Milk Repository for study. (Photo by John Minchillo/AP Photo)





In this April 6, 2018, photo, Winsol, an aardvark born in December, stands beside his mother Ali in their enclosure at the Cincinnati Zoo & Botanical Garden in Cincinnati. (Photo by John Minchillo/AP Photo)





A male pheasant walks along the island’s dunes during mating season near Norderney, Germany on April 23, 2018. (Photo by Picture-Alliance/Barcroft Images)





In this photo provided by the Vienna zoo Schoenbrunn, female red panda Mahalia sits in the enclosure in Vienna Monday, April 30, 2018. Mahalia will get a new partner from Italy, male panda Manjul of the Parco Faunistico La Torbiera. (Photo by Daniel Zupanc/Zoo Schoenbrunn via AP Photo)





In this April 19, 2018 photo, an alligator sunbathes in the water treatment area of the Taino Aqua Farm fish plant, next to Lake Azuei in Fond Parisien, Haiti. The fish farm treats the water that gets bloody from the processing of its tilapia fish, before sending it to the town's sewage system. The alligator was acquired from a local fisherman and put here to isolate it, where workers feed it and give it fresh water. (Photo by Dieu Nalio Chery/AP Photo)





Haflinger horses run during this years's first turn-out to grass at Europe's largest Haflinger stud-farm in Meura, Germany, Sunday, April 29, 2018. More than 300 Haflinger horses are living there. (Photo by Jens Meyer/AP Photo)