A fox looks for food on a snow-covered pasture in Burang County of Ngari Prefecture, southwest China's Tibet Autonomous Region, April 7, 2015. (Xinhua/Ge Qingmin)

A fox looks for food on a snow-covered pasture in Burang County of Ngari Prefecture, southwest China's Tibet Autonomous Region, April 7, 2015. (Xinhua/Ge Qingmin)

A fox looks for food on a snow-covered pasture in Burang County of Ngari Prefecture, southwest China's Tibet Autonomous Region, April 7, 2015. (Xinhua/Ge Qingmin)

A fox looks for food on a snow-covered pasture in Burang County of Ngari Prefecture, southwest China's Tibet Autonomous Region, April 7, 2015. (Xinhua/Ge Qingmin)