A ranger measures a trace left by wild animals on snow in the forest of the Hunchun National Siberian Tiger Nature Reserve, northeast China's Jilin Province, Feb. 3, 2016. Siberian tigers were among the world's most endangered species. At least 27 wild Siberian tigers and 42 Amur leopards were living in the east part of northeast China's Jilin Province. (Xinhua/Xu Chang)
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