A six-day-old hippopotamus is pictured next to his mother, Kara, aged 21, on September 12, 2012 at “Planet sauvage” (“Wild planet”) Zoo in Port-Saint-Pere, western France. The birth, a rare event for this species in captivity, occured on September 7, 2012 in the Zoo. (Photo by Frank Perry/AFP Photo)

Ten day old male Gorilla “Fataki” clings to his mother “Frala” during his media debut at Taronga Zoo June 4, 2003 in Sydney, Australia. Fataki was born on May 24, 2003 and was the fourth Gorilla to be born at Taronga Zoo since the opening of the Gorilla Forest in 1997. (Photo by Chris McGrath/Getty Images)

Costume actors to wait before the show at “Chian Tourism Day” Inauguration Ceremony in Ninghai Zhejiang Province on May 19, 2011 in Ninghai, China. Various activities in local famous historic sites are being held to mark the day “China Tourism Day” on May 19. (Photo by Lintao Zhang/Getty Images)

Assam's Veerangana commandos take part in a rehearsal for India's Republic Day parade at Khanapara in Guwahati, India January 23, 2017. India celebrates its annual Republic Day on January 26. (Photo by Anuwar Hazarika/Reuters)

A racegoer flashes her undies in front of the racing crowd during Caulfield Cup Day at Caulfield Racecourse on October 21, 2017 in Melbourne, Australia. (Photo by Splash News and Pictures)

A young woman wearing a t-shirt reading “p*ssy Power” takes part in a rally, demonstrating against gender violence and calling for gender parity on March 8, 2018 in Milan, Italy. International Women's Day is a global day observed on March 8 every year, celebrating the social and political achievements of women. (Photo by Emanuele Cremaschi/Getty Images)

A woman looks out of her house with a decorated doorway during Corpus Christi day in Zahara de la Sierra, southern Spain, May 29, 2016. The village of Zahara de la Sierra celebrated the feast of Corpus Christi (or Body of Christ in Latin) by covering the streets and facades of houses with the branches of trees and grass. (Photo by Jon Nazca/Reuters)

Britain Horse Racing, Royal Ascot, Ascot Racecourse on June 16, 2016. Ladies Day Racegoers wear hats. (Photo by Toby Melville/Reuters)