Meerkat quadruplets are seen with their mother Maru (R) at Chiba Zoological Park on June 1, 2017 in Chiba, Japan. The quadruplets were born end of last month. (Photo by The Asahi Shimbun via Getty Images)





This Thursday, June 1, 2017 photo provided by the County of San Diego shows one of the nine hedgehogs, now under the care of County Animal Services after they were rescued Thursday, from a trash can in Ocean Beach, Calif. (Photo by Andy Tolley/County of San Diego via AP Photo)





A dog takes part in a parade marking St Petersburg City Day in the garden of the Russian Academy of Arts in St Petersburg, Russia on May 27, 2017. (Photo by Peter Kovalev/TASS)





A golden monkey is seen in the woods at Dalongtan Golden Monkey Research Center in Shennongjia, central China's Hubei Province, May 29, 2017. (Photo by Li Haigui/Xinhua/Barcroft Images)





In this photo taken Monday, May 29, 2017 a white stork takes off as another one remains standing in the nest during sunset in Balmazujvaros, 200 kms east of Budapest, Hungary. (Photo by Zsolt Czegledi/MTI via AP Photo)





Siberian tiger female Betty yawning and resting in enclosure at the city zoo in Olomouc, Czech Republic on May 29, 2017. (Photo by Slavek Ruta/Rex Features/Shutterstock)





Visitors feed bananas to a herd of giraffes on the giraffe feeding platform at the wildlife park Safari World in Minburi district, Bangkok, Thailand, 27 May 2017 (issued 29 May 2017). The Giraffes feeding platform is one of the park's most popular attractions where visitors can buy a bucket of bananas for 100 Thai baht (around 2.7 Euros) and feed the giraffes. According to park statements, the herd of giraffes is the world's largest in captivity. (Photo by Diego Azubel/EPA)





A Nilgai or blue bull (Boselaphus tragocamelus) runs with grass in its mouth at the Van Vihar National Park in Bhopal, India, 27 May 2017. Van Vihar which was declared a national park in 1983, covers an area around 445.21 hectares. Although having the status of a national park, Van Vihar is developed and managed as a modern Zoological Park. The animals are kept in their near natural habitat. Most of the animals are either orphaned brought from various parts of the state or are exchanged from other zoos. (Photo by Sanjeev Gupta/EPA)





A Cuckoo sits on a perch in the rain in woodland on Thursley Common on May 28, 2017 in Thursley, England. The United Kingdom has seen a 71 percent decline in the breeding population of Cuckoos over the last 25 years. The fall in numbers is thought to be linked to the migration routes the birds take to get to their wintering grounds in the Congo Basin in West Africa. After a study of satellite tagged birds by the BTO (British Trust for Ornithology), between 2011 and 2014 it was thought that those traveling South East through Italy or the Balkans fared better than those taking the more direct route South West through Spain and Morocco despite being 12 percent longer. The environmental conditions at stop over sites are thought to be the main thing that determine the birds' migration success with drought and wildfires on the shorter routes having a negative effect. That pattern continues and the Cuckoo remains on the Red List of Birds of Conservation Concern, where it has been since 2009. (Photo by Dan Kitwood/Getty Images)





Giant pandas Wu Wen and Xing Ya, both three and half years old, staged an enchanting debut on Tuesday, May 31, 2017 at the Ouwehands Zoo in Rhenen City, the Netherlands, where they will stay for 15 years. (Photo by Xinhua News Agency/Rex Features/Shutterstock)





Visitors watch giant panda Wu Wen at the Ouwehands Zoo in Rhenen City, the Netherlands, May 30, 2017. Giant pandas Wu Wen and Xing Ya, both three and half years old, staged an enchanting debut on Tuesday at the Ouwehands Zoo, where they will stay for 15 years. (Photo by Gong Bing/Xinhua/Barcroft Images)





A fourteen-week-old red kangaroo (Macropus rufus) peeps from its mother's pouch in their enclosure in Nyiregyhaza Zoo in Nyiregyhaza, Hungary, 29 May 2017. (Photo by Attila Balazs/EPA)





A corgi dog sports a pair of sunglasses as it walks the National Mall with its owners on Memorial Day holiday weekend in Washington, U.S., May 28, 2017. (Photo by Kevin Lamarque/Reuters)





A girl takes a picture while an elephant and its mahout swim at Khao Kheow Zoo in Chonburi, outside Bangkok, Thailand June 1, 2017. (Photo by Jorge Silva/Reuters)





A baby Black-crowned Night Heron squawks in its incubator while being cared for at City Wildlife rescue and rehabilitation center in Washington, DC on May 31, 2017. The heron is one of several that have been brought to CW by the staff at The National Zoo over the past few years. The heron is a native bird and has made an established rookery inside the zoo grounds over a hundred years ago. Every year at this time, some of the chicks get pushed or fall out of the nest and require human care. Because the birds are native and not part of the Smithsonian collection, they partnered with CW to rehabilitate the herons for re-release back to the flock inside Zoo. They're reintroduced back to their flock so that they can migrate together in the Fall. The Black-crowned heron usually migrates from the DC area down to southeast North Carolina, some going as far as Jacksonville, FL in winter. The Black-crowned heron is the species of greatest conservation need in the District of Columbia because their numbers are in such rapid decline due to habitat loss. (Photo Linda Davidson/The Washington Post)





A herd of wild horses gallops into an arena in the Merfelder quarry in Duelmen, western Germany, Saturday, May 27, 2017. Each year the one-year-old stallions are being caught and removed from the herd. (Photo by Henning Kaiser/DPA via AP Photo)





A polar bear swims with a ball in his swimming pool in Wuppertal, western Germany, on May 30, 2017. (Photo by Ina Fassbender/AFP Photo/DPA)





In this photo taken on Wednesday March 15, 2017, Kevin Richardson, popularly known as the “lion whisperer”, takes two of his lions for a walk in the Dinokeng Game Reserve, near Pretoria, South Africa. Richardson seeks to raise awareness about the plight of Africa's lions, whose numbers in the wild have dwindled in past decades. (Photo by Denis Farrell/AP Photo)





In this photo taken on Wednesday, March 15, 2017, Kevin Richardson, popularly known as the “lion whisperer”, interacts with one of his lions while out for a walk in the Dinokeng Game Reserve, near Pretoria, South Africa. (Photo by Denis Farrell/AP Photo)





In this photo taken on Wednesday, March 15, 2017, Kevin Richardson, popularly known as the “lion whisperer”, interacts with one of his lionesses in the Dinokeng Game Reserve, near Pretoria, South Africa. (Photo by Denis Farrell/AP Photo)





In this photo taken on Wednesday, March 15, 2017, Kevin Richardson, popularly known as the “lion whisperer”, interacts with one of his lions while out for a walk in the Dinokeng Game Reserve, near Pretoria, South Africa. (Photo by Denis Farrell/AP Photo)





In this photo taken on Wednesday, March 15, 2017, Kevin Richardson, popularly known as the “lion whisperer”, ends a two-hour walk with three of his lions in the Dinokeng Game Reserve, near Pretoria, South Africa. (Photo by Denis Farrell/AP Photo)





Alpacas Romeo (L) and Juliette, groomed for summer season, walk inside an open-air enclosure at the Royev Ruchey Zoo in the suburb of Krasnoyarsk, Siberia, Russia May 31, 2017. (Photo by Ilya Naymushin/Reuters)





Tess, a two-toed sloth, hangs upside-down as she is presented to visitors at SeaWorld in San Diego, California, U.S., May 31, 2017. (Photo by Mike Blake/Reuters)