People board a train at the West Railway Station on January 7, 2012 in Beijing, China. China's railways are bracing themselves as millions of migrant labourers are set to leave cities for their native villages to celebrate the Chinese New Year. (Photo by Lintao Zhang/Getty Images)

Impala pictured in the Kruger National Park on December 7, 2007 in Mpumalanga, South Africa. (Photo by Warren Little/Getty Images)

Artist Will Ryman poses for photographs next to his installation entitled “The Bed” at the Saatchi Gallery in Chelsea on January 7, 2008 in London, England. (Photo by Chris Jackson/Getty Images)

Ayesha Farooq, 26, Pakistan's only female war-ready fighter pilot watches an airforce jet about to take off at Mushaf base in Sargodha, north Pakistan June 7, 2013. Farooq, from Punjab province's historic city of Bahawalpur, is one of 19 women who have become pilots in the Pakistan Air Force over the last decade – there are five other female fighter pilots, but they have yet to take the final tests to qualify for combat. A growing number of women have joined Pakistan's defence forces in recent years as attitudes towards women change. (Photo by Zohra Bensemra/Reuters)

A toddler sits on the winner of the giant pumpkin category during the RHS (Royal Horticultural Society) London Harvest Festival Show at RHS Lindley Halls on October 6, 2015 in London, England. The traditional harvest themed show runs October 6-7 and showcases a wide range of late summer grown fruit and vegetables. (Photo by Ben Pruchnie/Getty Images)

A Palestinian young woman from the Birzeit University looks on during clashes with Israeli security forces in Beit El, on the outskirts of the West Bank city of Ramallah, on October 7, 2015. New violence rocked Israel and the Israeli-occupied West Bank, including a stabbing in annexed east Jerusalem, even as Israel and Palestinian president Mahmud Abbas took steps to ease tensions. (Photo by Abbas Momani/AFP Photo)

Two brides kiss during their wedding ceremony to each other at the wedding registry office in St. Petersburg November 7, 2014. The two St. Petersburg women married in the official city ceremony last week, seemingly circumventing Russia's ban on same-s*x marriages. One of the brides was born a man but is undergoing hormone therapy and considers herself a woman. Though her male passport identity ensured the marriage was legal by Russian law, a St. Petersburg lawmaker has vowed to nullify their wedding. (Photo by Reuters/Stringer)