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In this picture taken on August 24, 2017, Liang Fengen, a ranger at the Nuanquan River Forestry Centre, gestures as he surveys an area in Suiyang town, Mudanjiang municipality. In the northern mountains bordering Russia, everyone knew the spry Chinese man as a skilled and ruthless hunter -- the kind who once killed a mother black bear as her cubs looked on. But instead of stalking the woods for prey, Liang Fengen now roams the hills without a rifle, working as a ranger to save the area's endangered Siberian tiger population and protect other wildlife. / AFP PHOTO / Nicolas ASFOURI / TO GO WITH China-conservation-animal, FEATURE by Yanan WANG (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)

In this picture taken on August 24, 2017, Liang Fengen, a ranger at the Nuanquan River Forestry Centre, gestures as he surveys an area in Suiyang town, Mudanjiang municipality. In the northern mountains bordering Russia, everyone knew the spry Chinese man as a skilled and ruthless hunter -- the kind who once killed a mother black bear as her cubs looked on. But instead of stalking the woods for prey, Liang Fengen now roams the hills without a rifle, working as a ranger to save the area's endangered Siberian tiger population and protect other wildlife. / AFP PHOTO / Nicolas ASFOURI / TO GO WITH China-conservation-animal, FEATURE by Yanan WANG (Photo credit should read NICOLAS ASFOURI/AFP/Getty Images)
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