A three-day old female hippopotamus (Hippopotamus amphibius) with her mother are seen in their enclosure at the Africarium in Zoo in Wroclaw, Poland, 24 May 2016. (Photo by Maciej Kulczynski/EPA)





Two of five endangered Hawksbill turtles being released on a Sharjah beach after being nursed back to health by marine biologists at Sharjah Aquarium in the United Arab Emirates in celebration of World Turtle Day on May 23, 2016. (Photo by Arman Avdic/Reuters)





Alpacas Romeo (R) and Juliette, one-year old and two-year old, are pictured after they were groomed inside their open air cage at the Royev Ruchey Zoo in the suburbs of Krasnoyarsk, Siberia, Russia, May 24, 2016. (Photo by Ilya Naymushin/Reuters)





An employee plays with Bella, a one-year old guanaco, next to Romeo, a one-year old alpaca, and Juliette, a two-year old, after alpacas were groomed inside their open air cage at the Royev Ruchey Zoo in the suburbs of Krasnoyarsk, Siberia, Russia, May 24, 2016. (Photo by Ilya Naymushin/Reuters)





Alpacas Romeo (L) and Juliette, one-year old and two-year old, walk after they were groomed inside their open air cage at the Royev Ruchey Zoo in the suburbs of Krasnoyarsk, Siberia, Russia, May 24, 2016. (Photo by Ilya Naymushin/Reuters)





A family of chimpanzees, donated by Sweden's Kolmarden Wildlife Park, are seen at their new enclosure at the Aurora zoo in Guatemala City, Guatemala, May 24, 2016. (Photo by Saul Martinez/Reuters)





A chimpanzee, donated by Sweden's Kolmarden Wildlife Park, eats a corn cob at its new enclosure at the Aurora zoo in Guatemala City, Guatemala, May 24, 2016. (Photo by Saul Martinez/Reuters)





A family of chimpanzees, donated by Sweden's Kolmarden Wildlife Park, are seen at their new enclosure at the Aurora zoo in Guatemala City, Guatemala, May 24, 2016. (Photo by Saul Martinez/Reuters)





A group of Komodo dragons eat a goat in Komodo National park, a popular tourist destination in eastern Indonesia, May 24, 2016 in this photo taken by Antara Foto. (Photo by Wahyu Putro A./Reuters/Antara Foto)





A Chaffinch bird eats the remains of a cake during Britain's Prince Charles and his wife, Camilla Duchess of Cornwall's visit to Glenveagh National Park during a tour to Donegal, Ireland May 25, 2016. (Photo by Clodagh Kilcoyne/Reuters)





A Chaffinch bird eats the remains of a cake during Britain's Prince Charles and his wife, Camilla Duchess of Cornwall's visit to Glenveagh National Park during a tour to Donegal, Ireland May 25, 2016. (Photo by Clodagh Kilcoyne/Reuters)





A Chaffinch bird flies through Glenveagh National Park during Britain's Prince Charles and his wife, Camilla Duchess of Cornwall's tour to Donegal, Ireland May 25, 2016. (Photo by Clodagh Kilcoyne/Reuters)





Horses look out a window of their stable near the village of Pontoiraklia, Greece, May 27, 2016. (Photo by Marko Djurica/Reuters)





A Grévy’s zebra and new-born foal in Whipsnade, UK on May 26, 2016. (Photo by Tony Margiocchi/Barcroft Images)





One of a pair of beavers released into a river in Devon to boost the genetic diversity of England’s only wild population of the mammals. The male and female were set free on the River Otter as part of a five-year trial to monitor the impact of Eurasian beavers, a species hunted to extinction hundreds of years ago in the UK, on the surrounding landscape, wildlife and economy. (Photo by Nick Upton/Naturepl.com/PA Wire)





Thread-winged lacewing – wood fairy (Nemoptera bipennis) – insect on grass in Andalucia, Spain. (Photo by Perry van Munster/Alamy Stock Photo)





Great crested terns (aka sterna bergii) lay on their eggs during the breeding season on May 20, 2016 on Fasht al Jarim Island, north of the Bahraini capital Manama. (Photo by Mohammed Al-Shaikh/AFP Photo)





A yellow monitor lizard at a wetland in Chandpara in Kolkata, India. On 8 September 2015, 17 eggs were found in a hole of an earthen house. The eggs were kept in a plastic container which was ventilated and the humidity inside the container was maintained by spraying water. On 16 May, after eight months of finding these eggs,17 healthy yellow monitor lizards hatched out of the eggs. On the same day, the lizards were released in a wetland, in their natural habitat. (Photo by Manas Sarkar/Barcroft Images)





Huddled together, fur standing on end, these mountain goat kids were clearly not enjoying the lightning storm atop Mount Evans, a 14,000ft peak in Colorado. Verdon Tomajko captured these stunning images of goats leaping between boulders and sticking together against a backdrop of dark grey skies and a lightning flash. (Photo by Verdon Tomajko/Rex Features/Shutterstock)





Malui the gorilla with her twins, the first born in central Africa in 16 years. The gorillas were named Ingada, after the leaves their mother nested on whilst giving birth, and Inguka, the leaves their mother fed on while pregnant. (Photo by WWF/The Guardian)





Royal oxen eat rice and corn during the Royal Ploughing Ceremony procession near Bayon temple in Siem Reap province, Cambodia, 24 May 2016. The Royal Ploughing Ceremony is celebrated to predict the upcoming distribution of rainfall and agricultural harvesting in the country through the oxen's appetite of paddy, corn, beans, grass, sesame, water or wine. (Photo by Mak Remissa/EPA)





Elk calf Jamie-Lee seen in the elk enclosure of the Wisentgehege Springe zoo in Springe, Germany, 24 May 2016. The baby elk was named after Jamie-Lee Kriewitz who represented Germany in the 2016 Eurovision Song Contest (ESC) and grew up in the region. The female elk calf was born on the day of the ESC final. (Photo by Holger Hollemann/DPA via ZUMA Press)





Fox cubs Chili (L) and Kuemmel (Cumin) play on a meadow at the Wisentgehege zoo near Springe, Germany, 24 May 2016. The fox cubs are doing quite well after having been taken in by the zoo and being hand-reared. (Photo by Holger Hollemann/DPA via ZUMA Press)





A meerkat pup (R) sits in its enclosure at the zoo in Hanover, Germany, 27 May 2016. Five meerkat pups are roaming the enclosure since a couple of days. (Photoby Julian Stratenschulte/DPA via ZUMA Press)





An Indian white tiger cools off in a pond in its enclosure at Chhat Bir Zoo on the outskirts of Chandigarh on May 22, 2016. Temperatures have soared to a scorching 51 degrees Celsius in one Indian city, meteorologists said, with the ferocious heat setting a new national record. Northern Phalodi wilted as the mercury reached a new high on May 20, equivalent to 123.8 Fahrenheit, beating a 60-year-old record. (Photo by Shammi Mehra/AFP Photo)





A duckling looks at three carps swimming in a pond of the Hofgarten park in Veitshoechheim near Wuerzburg, southern Germany, on May 24, 2016. (Photo by Karl-Josef Hildenbrand/AFP Photo/DPA)





Giraffes stand in their enclosure at the African Reserve (Réserve Africaine ) of Sigean, southern France on May 24, 2016. (Photo by Raymond Roig/AFP Photo)





One-year-old teacup pig Schwupsi walks on a leash at Vienna's Heldenplatz in front of the Hofburg Palace in Vienna, Austria, 25 May 2016. (Photo by Christian Bruna/EPA)





A swan takes off from a lake on a foggy day near the village of Vyazyn, 65 km ( 40 miles ) north of the capital Minsk, Belarus, Wednesday, May 25, 2016. (Photo by Sergei Grits/AP Photo)





This Wednesday, May, 25, 2016 photo made available by Chip Michalove shows a large tiger shark off the coast of Hilton Head, S.C. The 1,400 pound shark named Chessie was tagged a year ago and was caught again this year by the same fisherman off the coast of South Carolina. (Photo by Chip Michalove via AP Photo)





A bird hovers over her nest in the reeds on the lake on a foggy day near the village of Vyazyn, 65 km ( 40 miles ) north of the capital Minsk, Belarus, Wednesday, May 25, 2016. (Photo by Sergei Grits/AP Photo)





Gray seal “Moneypenny” watches the newcomer being fed in the neighboring tank through the rain-streaked glass in the breeding station in Friedrichskoog, Germany, 23 May 2016. A seal pup found on 11 May 2016 at the Olanddamm dam, may now leave quarantine and move into the breeding station as the first guest of the season. (Photo by Carsten Rehder/EPA)





Two parent storks clatter as they feed their offspring in a nest at Lake Steinhude in Bokeloh, Germany, 23 May 2016. One of the birds had been looking for food for about two hours. (Photo by Holger Holleman/EPA)





A seven-week old black lemur cub is with its mother in their enclosure in the Nyiregyhaza Zoo in Nyiregyhaza, 245 kms east of Budapest, Hungary, Tuesday, May 24, 2016. The parents arrived to Nyiregyhaza within the framework of the European Conservation Program. (Photo by Attila Balazs/MTI via AP Photo)





In this January 27, 2016, file photo, a zoo attendant feeds Hanako the elephant at Inokashira Park Zoo on the outskirts of Tokyo. The elderly elephant that set off a petition drive to move her out of her concrete pen in a small zoo in Japan died Thursday, May 26 at age 69. Hanako, or “flower child”, was a gift from the Thai government in 1949 and lived in Inokashira Park Zoo in Tokyo since she was 2. She was Japan's oldest elephant and had a long life for captive Asian elephants. (Photo by Eugene Hoshiko/AP Photo)