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The tent encampment of an expedition led by American biologist George Schaller in the Wakhan Corridor of north-eastern Afghanistan, 2004. The expedition spent two months traveling in the region of the Wakhan and Pamir to survey wildlife. (Photo by Scott Wallace/Getty Images)

The tent encampment of an expedition led by American biologist George Schaller in the Wakhan Corridor of north-eastern Afghanistan, 2004. The expedition spent two months traveling in the region of the Wakhan and Pamir to survey wildlife. (Photo by Scott Wallace/Getty Images)