A Humboldt penguin slides off the scales after being weighed during a photocall at London Zoo on August 24, 2016, to promote the zoo's annual weigh-in event in London on August 24, 2016. (Photo by Justin Tallis/AFP Photo)





One-year-old female giant panda cub Nuan Nuan reacts inside her enclosure during joint birthday celebrations for the panda and its ten-year-old mother Liang Liang at the National Zoo in Kuala Lumpur on August 23, 2016. Giant pandas Liang Liang, aged 10, and her Malaysian-born cub Nuan Nuan, 1, were born on August 23, 2006 and August 18, 2015 respectivetly. (Photo by Mohd Rasfan/AFP Photo)





A keeper carries one-year-old female giant panda cub Nuan Nuan inside her enclosure during joint birthday celebrations for the panda and its ten-year-old mother Liang Liang at the National Zoo in Kuala Lumpur on August 23, 2016. (Photo by Mohd Rasfan/AFP Photo)





Liang Liang, left, formerly known as Feng Yi, a female giant panda from China, plays with her one year old female cub Nuan Nuan, at the Giant Panda Conservation Center during her 10th birthday celebration at the National Zoo in Kuala Lumpur, Malaysia, Tuesday, August 23, 2016. Two giant pandas have been on loan to Malaysia from China for 10 years since May 21, 2014 to mark the 40th anniversary of the establishment of diplomatic ties between the two nations. (Photo by Joshua Paul/AP Photo)





Australian rainbow lorikeets (parrots), cool off in a sprinkler on August 25, 2016, at the zoo of Pessac near Bordeaux, as temperatures soar across the country. (Photo by Georges Gobet/AFP Photo)





Female White Lion Ivanna yawns on a hot sunny day in a private zoo in the village of Demydiv 50 kilometres west of Kiev, Ukraine, Sunday, August 21, 2016. Most white lions live in captivity, as the rare color mutation is widely believed to make it difficult for white lions to survive in the wild. (Photo by Efrem Lukatsky/AP Photo)





Eighteen-month-old visitor Jose Tavarez of Dover, Delaware, watches a California sea lion at the Smithsonian National Zoological Park August 22, 2016 in Washington, DC. Bei Bei, the youngest giant panda cub at the zoo turns one today. (Photo by Alex Wong/Getty Images)





An egret is seen in a channel in Rio de Janeiro, Brazil, August 23, 2016. (Photo by Vasily Fedosenko/Reuters)





A squirrel monkey sits on a scale during the annual weight-in at London Zoo in London, Britain August 24, 2016. (Photo by Neil Hall/Reuters)





A zebra stands in an enclosure at the Ramat Gan Safari Zoo near Tel Aviv, Israel August 25, 2016. (Photo by Baz Ratner/Reuters)





Tanda, a 23 year-old white rhinoceros and her week-old calf stand in their enclosure at the Ramat Gan Safari Zoo near Tel Aviv, Israel August 25, 2016. (Photo by Baz Ratner/Reuters)





Tanda, a 23 year-old white rhinoceros and her week-old calf stand in their enclosure at the Ramat Gan Safari Zoo near Tel Aviv, Israel August 25, 2016. (Photo by Baz Ratner/Reuters)





Tanda, a 23 year-old white rhinoceros and her week-old calf stand in their enclosure at the Ramat Gan Safari Zoo near Tel Aviv, Israel August 25, 2016. (Photo by Baz Ratner/Reuters)





A giraffe runs in Amboseli National park, Kenya August 26, 2016. (Photo by Goran Tomasevic/Reuters)





Zebras play in Amboseli National park, Kenya August 26, 2016. (Photo by Goran Tomasevic/Reuters)





Sampit, Melbourne zoo’s female Siamang ape, enjoys the pleasant weather after being placed in her new enclosure in Melbourne, Australia on August 24, 2016. (Photo by Tracey Nearmy/AAP)





A recovered hedgehog before its release near Kecskemet, 85 kms southeast of Budapest, Hungary, 24 August 2016. Some forty previously injured and rehabilitated animals belonging to protected species were released into the wild as a result of the joint efforts of Kecskemet Zoo and Kiskunsag National Park. (Photo by Sandor Ujvari/EPA)





A trainer feeds a Pacific walrus during a performance in the Delfinia oceanography and marine biology centre of the Novosibirsk Zoo in Novosibirsk, Russia on August 19, 2016. (Photo by Kirill Kukhmar/TASS via ZUMA Press)





A picture made available on 26 August 2016 shows a Common Kingfisher flying to catch a fish in Guri, Gyeonggi province, South Korea, 25 August 2016. (Photo by Kim Jae-Sun/EPA)





A picture made available on 26 August 2016 shows a Common Kingfisher flying to catch a fish in Guri, Gyeonggi province, South Korea, 25 August 2016. (Photo by Kim Jae-Sun/EPA)





A newborn California sea lion gets a pat from its mother at Harbin Polar land in Harbin, China on August 23, 2016. The sea lion De Bei gave birth to a sea lion cub at the park on Monday. (Photo by Imago via ZUMA Press)





In this Thursday, August 18, 2016 photo, a herd of wild elephants cross a dirt road in Pana, southeastern province of Chanthaburi, Thailand. To stop wild elephants rampaging through their crops, farmers are trying a pilot scheme run by the Thai Department of National Parks that is deploys bees as a new line of defense, exploiting elephants' documented fear of bee stings. (Photo by Gemunu Amarasinghe/AP Photo)





A picture made available on 25 August 2016 shows a Siamang gibbon enjoying the spring weather as they are released into their new enclosure on the island near the Japanese Garden, at Melbourne Zoo in Melbourne, Victoria, Australia, 24 August 2016. Siamangs are the largest of the nine gibbon species, the pairs forming lasting bonds. Sampit and Isidor have been together since 2001 and have produced four offspring as part of the regional breeding program for their endangered species. (Photo by Tracey Nearmy/EPA)





Brown bear Benni at the Berg Zoo in Halle, Germany on August 23, 2016. (Photo by Steffen Schellhorn/Action Press/Startraksphoto.com)





A pink flamingo puts its beak in the water at the Menagerie of the Jardin des plantes (the small zoo of the Garden of Plants) in Paris, on August 26, 2016, during a heatwave in France. (Photo by Patrick Kovarik/AFP Photo)





This undated handout file photo shows spinner dolphins in the Northwestern Hawaii Islands. US federal officials are seeking a ban on swimming with Hawaii's spinner dolphins, saying the encounters popular with tourists are harming the nocturnal creatures' sleeping habits. (Photo by James Watt/AFP Photo/NOAA)





Elephant calf Ayo plays around in awading pool at Bergzoo zoological gardens in Halle/Saale, Germany, 21 August 2016. Earlier in the day the calf was given the name Ayo, which translates to “luck”. Ayo and his half sister Tamika, born in June, are the zoos latest crowd favourites. (Photo by Hendrik Schmidt/EPA)





Black Sloth Bear wounding round, fighting and standing up in the Berlin zoo, Germany on August 25, 2016. (Photo by Tollkühn/Ullstein Bild via Getty Images)





In this video frame grab taken Saturday August 20, 2016 in Tyumen, Russia, a 16-year-old cat called Rosinka, carries a three-week-old baby monkey on her back. Russian cat has adopted a baby squirrel monkey after he was abandoned by his mother at a zoo, comforting the little primate by letting him cling to her back for warmth. (Photo by AP Photo)





A squirrel attempts to take a drink from a bottle of water in Valentines Park in East London on the hottest day of the year in the UK so far, August 23, 2016. (Photo by Jeff Moore/Splash News)





A wild black-tailed deer doe feeds on a bitter quince fruit alongside a country road near Elkton in southwestern Oregon on August 21, 2016. A quince is a sour pear-like fruit used in many cultures to make make jams, jellies, wines, liqueurs and other dishes. (Photo by Robin Loznak/ZUMA Press/Splash News)





A squirrel holds walnut in its mouth as it climbs a Douglas fir tree along a country road in southwestern Oregon on August 21, 2016. (Photo by Robin Loznak/ZUMA Press/Splash News)





Keepers at Taronga Western Plains Zoo are delighted to report early sightings of a male Koala joey that is now just over five months old and starting to emerge from its mother's pouch. The yet to be named Koala joey is the third offspring for mother, Wild Girl who is displaying very positive nurturing behaviours. Wild Girl arrived at the Zoo's Wildlife Hospital after being hit by a car. Unfortunately because of her injuries she couldn't be released. She joined the Zoo's Koala group in early 2013 and has since played an important role in the breeding program. (Photo by Splash News and Pictures)