A pigeon flies away from a bridge in front of the towers of the banking district in Frankfurt, Germany, Monday, August 1, 2016. (Photo by Michael Probst/AP Photo)





Seagulls sit on a rope of a tied missile cruiser in the far eastern port of Vladivostok, Russia, July 31, 2016. (Photo by Yuri Maltsev/Reuters)





Lemurs eat watermelon to cool off as the city's highest temperatures remaining above 38 degrees Celsius (100 degrees Fahrenheit) for 10 days in Hangzhou, Zhejiang province, July 31, 2016. (Photo by Reuters/Stringer)





Tiger Yasha shows his tongue in Hagenbecks zoo in Hamburg, northern Germany on August 4, 2016. (Photo by Fabian Bimmer/Reuters)





Tiger Yasha yawns in Hagenbecks zoo in Hamburg, northern Germany on August 4, 2016. (Photo by Fabian Bimmer/Reuters)





2016 Rio Olympics, Rowing, Preliminary, Men's Single Sculls Heats, Lagoa Stadium, Rio De Janeiro, Brazil on August 6, 2016. A bird sits on a dock before competition begins. (Photo by Carlos Barria/Reuters)





The male elephant baby looks out of their enclosure in Halle, eastern Germany, Friday, August 5, 2016. The elephant was born on Aug. 3, 2016, and weights 105 kilograms. (Photo by Jens Meyer/AP Photo)





Rare Amur leopard cubs born at Twycross Zoo, UK. It is believed there are only 70 Amur leopards in the wild, with Twycross Zoo saying the new arrivals could help ensure the long-term survival of the species. The birth of the cubs five weeks ago to parents Kristen and Davidoff was captured on camera – with the cubs already making an appearance in public at the Leicestershire zoo. (Photo by The Guardian)





White tigress Cleopatra pets one of three newly born tiger cubs in Tbilisi Zoo, Georgia, Wednesday, August 3, 2016. Triplet cubs of a rare breed of white lion have been born in Tbilisi zoo. It is the first addition to the lion family since the devastated flooding in 2015 that killed almost half of its inhabitants. (Photo by Shakh Aivazov/AP Photo)





A young Elsa, boar piglet sits beside her new friend Ziva the collie in Dillenburg, Germany on August 5, 2016. After a near death experience in the woods, this little boar piglet found some new furry friends and a home. Ziva the collie and Leopold the Bengal cat welcomed Elsa with open arms when the piglet lost her mother and the rest of her family in the woods. She was brought to Wild Animal Rescue Schelder Forest (WARSF) in Dillenburg, Germany to be looked after by animal lovers Werner and Angelika Schmaing. (Photo by Animal Press/Barcroft Images)





Nupela, a Goodfellow's tree kangaroo, stands on a branch in her exhibit at the Singapore Zoo during a media preview, 03 August 2016. Along with her mate Makaia, the two marsupials were transferred from Australia as part of the Global Species Management Plan, which helps to breed threatened species in a controlled and safe environment. (Photo by Wallace Woon/EPA)





Makaia, a Goodfellow's tree kangaroo, pictured on a platform in a holding area at the Singapore Zoo during a media preview, 03 August 2016. (Photo by Wallace Woon/EPA)





A two-month old Siberian tiger (Panthera tigris altaica) cub is released from the transport box into its enclosure in Veszprem Zoo in Veszprem, 108 kms southwest of Budapest, Hungary, 03 August 2016. (Photo by Boglarka Bodnar/EPA)





A two-month old Siberian tiger (Panthera tigris altaica) cub snarls in its enclosure in Veszprem Zoo in Veszprem, 108 kms southwest of Budapest, Hungary, 03 August 2016. The cub is one of the two that were born in the Veszprem Zoo in June. (Photo by Bodnár Boglárka/MTI/MTVA)





Hippo baby “Pumeza” is seen in Hannover Zoo, Germany on August 3, 2016 together with mother “Cherry”. (Photo by Holger Hollemann/DPA)





A Golfina sea turtle (Lepidochelys olivacea) arrives to spawn in Ixtapilla, Michoacan state, Mexico on July 30, 2016. The sea turtles, known as “Arribadas”, arrive yearly massively to lay their eggs on the beach. (Photo by Enrique Castro/AFP Photo)





A Golfina sea turtle (Lepidochelys olivacea) arrives to spawn in Ixtapilla, Michoacan state, Mexico on July 30, 2016. (Photo by Enrique Castro/AFP Photo)





Coati eat frozen fruit at Rome's Bioparco zoo, to cool off from the searing heat, on August 4, 2016. (Photo by Andreas Solaro/AFP Photo)





Rain drops sit on the window of the indoor pools of the penguins at the zoo in Frankfurt, Germany, August 5, 2016. (Photo by Michael Probst/AP Photo)





Technical member of the airport of Liege load the horses that will compete to the Olympic Games 2016 of Brazil in the airplane in Liege, Belgium, August 6, 2016. Much of the horses that will compete at the Olympic Games 2016 flew from the airport of Liege to Brazil. (Photo by Stephanie Lecocq/EPA)





Muja the alligator moves in the pond in Belgrade Zoo, in Belgrade Serbia, Friday, August 5, 2016. The American alligator called Muja is the oldest animal in the Serbian capital's small Zoo, and the employees at the zoo say he at least 80-years-old. (Photo by Darko Vojinovic/AP Photo)





In this picture taken Thursday, August 4, 2016, seal Tristan looks out of a basket while being released into the North Sea together with others at the beach of the island Juist, Germany. He is part of the first group of released seals of the seal breeding station Norddeich this year. (Photo by Carmen Jaspersen/DPA via AP Photo)





One-month-old female Bengal tiger cubs play inside a cage at a zoo in Medan, North Sumatra province, Indonesia, 01 August 2016. A ten-year-old Bengal tiger named Wesa, gave birth to two tiger cubs on 22 June. (Photo by Dedi Sinuhaji/EPA)





Gorilla Kira holds her baby at Moscow's zoo, Russia, Thursday, August 4, 2016. The baby was born on July, 22 and she's already living with her mother and other gorillas. (Photo by Alexander Zemlianichenko/AP Photo)





In this photo taken on Thursday, August 4, 2016, Gorilla Kira holds her baby at Moscow's zoo, Russia. (Photo by Alexander Zemlianichenko/AP Photo)