The moon shines through trees at a United Nations displacement camp at dusk on March 14, 2011 in Ras Jdir, Tunisia. (Photo by Dan Kitwood/Getty Images)

Animal rights activists covered with fake blood sit on the floor during a protest against the use of animals in research to mark World Day for Animals in Laboratories in central Madrid April 24, 2014. The sign reads, “How many rabbits do your shampoo kill?”. (Photo by Andrea Comas/Reuters)

A model prepares backstage ahead of the David Jones Autumn Winter 2017 Collections Launch at St Mary's Cathedral Precinct on February 1, 2017 in Sydney, Australia. (Photo by Mark Nolan/Getty Images for David Jones)

Kendall Jenner dazzles as the face of La Perla's feminist lingerie collection in Los Angeles, California on November 10, 2016. The 21-year-old model stars in a new campaign for the brand centered on “the liberation of every woman from the need to suffer for beauty”, reports Entertainment Tonight. La Perla released photos of Jenner and fellow models Isabeli Fontana and Liu Wen in its Spring 2017 collection on Instagram this week. (Photo by Splash News and Pictures)

Roof-topping enthusiast Daniel Lau takes a selfie with high-rise buildings down below as he stands on the top of a skyscraper in Hong Kong, China on August 15, 2017. A craze that began in Russia has now taken hold in Hong Kong, one of the world's most vertical cities. Mr Lau said he had been inspired by Russian climbers and that he was unafraid of the vertiginous heights he scales. (Photo by ImagineChina/Rex Features/Shutterstock)

A walrus kisses a visitor during a sea animal show at the Hakkeijima Sea Paradise aquarium-amusement park complex in Yokohama, southwest of Tokyo, Monday, September 11, 2017. (Photo by Shizuo Kambayashi/AP Photo)

A man transports the carcass of a car on a two- wheeled carriage in a neighborhood in Abobo, a suburb of Abidjan, Côte d’Ivoire on December 1, 2017. (Photo by Issouf Sanogo/AFP Photo)

Prince Philip, Duke of Edinburgh practicing his bicycle polo technique, Windsor Great Park, Berkshire, 1964. (Photo by Norman Potter/Daily Express/Hulton Archive/Getty Images)