A boy moves away as a United Nations World Food Programme (WFP) helicopter lands in Rubkuai village, Unity State, northern South Sudan, February 18, 2017. South Sudan on Monday declared famine in some parts of the country, with more than three years of war leaving nearly five million hungry in what aid groups called a “man-made” tragedy. (Photo by Siegfried Modola/Reuters)

Women participate during the Mr. Olympia Amateur South America bodybuilding competition in Medellin, Colombia, February 19, 2017. (Photo by Fredy Builes/Reuters)

The Syrian refugee folklore troupe Abu Rustom perform at a wedding show at Zaatari refugee camp in the Jordanian city of Mafraq, near the border with Syria February 20, 2017. The Syrian troupe is trying to keep its country's traditions alive by holding traditional dances and performing celebratory sword fights during weddings and other occasions, according to the troupe's leader. (Photo by Muhammad Hamed/Reuters)

A model presents a creation at the Sophia Webster presentation during London Fashion Week in London, Britain February 20, 2017. (Photo by Neil Hall/Reuters)

Demonstrators take part in a protest against U.S. President Donald Trump in Glasgow, Britain February 20, 2017. (Photo by Russell Cheyne/Reuters)

A model poses backstage at the Topshop Unique catwalk show during London Fashion Week in London, Britain February 19, 2017. (Photo by Neil Hall/Reuters)

A young reveller participates in the annual Trinidad and Tobago Red Cross Society's Children's Carnival Competition at the Queen's Park Savannah in Port-Of-Spain, Trinidad and Tobago February 18, 2017. (Photo by Andrea De Silva/Reuters)

Servicemen of the Belarussian Interior Ministry's special forces unit perform during Maslenitsa celebrations, a pagan holiday marking the end of winter celebrated with pancake eating and shows of strength, at their base in Minsk, Belarus February 19, 2017. (Photo by Vasily Fedosenko/Reuters)