Two hippopotamus are fed with pumpkins at the Hanoi Zoo, in Hanoi, Vietnam, 25 October 2018. The zoo has been the home for more than 800 animals of over 90 different species, including three hippopotamus, since it was built in 1976. (Photo by Luong Thai Linh/EPA/EFE)

This photo of an elephant seal and Gentoo penguin shot by Andrew James in Yankee Harbour, Antarctica. (Photo by Andrew James/Travel Photographer of the Year)

In advance of Fleet Week performances, U.S. Navy Blue Angels fly above San Francisco with Team Oracle aerobatics pilots Sean D. Tucker and Jessy Panzer on Thursday, October 10, 2019. (Photo by Noah Berger/AP Photo)

A model presents a creation during a hair styling competition in Minsk, Belarus on November 9, 2017. (Photo by Sergei Gapon/AFP Photo)

Members of the University of Maryland women's lacrosse team react to something Trump said after posing for photographs during an event with NCAA championship teams at the White House on November 17, 2017. (Photo by Jabin Botsford/The Washington Post)

South Asian countries in terms of total contribution of travel and tourism to GDP. #6. Vietnam, Total GDP: USD 202.6 billion (2016). Contribution of Travel and Tourism to GDP: 9.1% . Here: A boat in the Thu Bon River, Hoi An, Vietnam. (Photo by Domingo Leiva/Getty Images)

Julia Wheeler, 31, from Perth, Western Australia, has been a hands reach away from pilot whales, Bull sharks, manta rays and more during her time diving without any breathing equipment. Here real life mermaid Julia is diving with manta rays in Bali and looks incredible swimming among them while holding her breath for four and a half minute. (Photo by Julia Wheeler/Caters News Agency)

Father Christmas hands out presents to children at the Aid And Adoption Society home at Leytonstone. (Photo by Gerry Cranham/Fox Photos/Getty Images). 7th December 1938