In this Friday, February 6, 2015 photo, sandhill cranes begin to stir after resting for the night at a roosting location along their winter migration route in Cecilia, Ky. According to counts made by biologists with the Kentucky Fish and Wildlife Resources, about 12,000 of the birds have stopped in Cecilia this week during their winter northward migration on their way to their nesting grounds in the Great Lakes region. (Photo by David Stephenson/AP Photo)

A devotee of the Chinese Ban Tha Rue shrine walks with guns pierced through his cheeks during a procession celebrating the annual vegetarian festival in Phuket, Thailand, October 17, 2015. The festival, featuring face-piercing, spirit mediums and strict vegetarianism celebrates the local Chinese community's belief that abstinence from meat and various stimulants during the ninth lunar month of the Chinese calendar will help them obtain good health and peace of mind. (Photo by Jorge Silva/Reuters)

A supporter of China's President Xi Jinping waits on the Mall for him to pass during his ceremonial welcome, in London, Britain, October 20, 2015. Xi is on a State visit to Britain. (Photo by Peter Nicholls/Reuters)

Russian soldiers dressed in Red Army World War II uniforms attend a rehearsal for the Nov. 7 parade in the Red Square with Spassky Tower in the background, in Moscow, Russia, Friday, November 6, 2015. The parade marks the 74th anniversary of a November 7 parade on Red Square when soldiers went directly to the front during World War II. For decades Nov. 7 was a holiday celebrating the 1917 Bolshevik Revolution. (Photo by Ivan Sekretarev/AP Photo)

A child rescued from Boko Haram in Sambisa forest is seen at the Internally Displaced People's camp in Yola, Nigeria May 3, 2015. Hundreds of traumatised Nigerian women and children rescued from Boko Haram Islamists have been released into the care of authorities at a refugee camp in the eastern town of Yola, an army spokesman said. (Photo by Afolabi Sotunde/Reuters)

A former paratrooper demonstrates his strength and skills while lifting a chair during the celebrations for the Paratroopers Day at the Central park in the Siberian city of Krasnoyarsk, Russia, August 2, 2015. Paratroopers are an elite unit of the Soviet Army, and everyone in the country recognize their blue berets. (Photo by Ilya Naymushin/Reuters)

An Indian boy dressed as Hindu god Shiva to attract alms from devotees chats with tourists as they sit on benches partially submerged in flood waters on the banks of the River Ganges in Allahabad, India, Thursday, July 30, 2015. The Ganges, one of India's largest rivers is flooded following monsoon rains. (Photo by Rajesh Kumar Singh/AP Photo)

A man drinks at a "colored" water cooler in a streetcar terminal in Oklahoma City, July 1939. (Photo by Reuters/Library of Congress)