It was a chilly February day. Dangwen and his wildlife monitoring team patrolled along the upper reaches of the Yangtze River. The river was frozen solid, easy for poachers to walk over. That day, they encountered 220 blue sheep, five white-lipped deer, and a line of otter footprints. On the infrared camera traps that they had set up throughout the valley, three snow leopards appeared, a mother and two cubs – and the cubs had grown much bigger than three months earlier. Dangwen comes from Yunta, a village located in Sanjiangyuan, Qinghai Province on the Tibetan Plateau. Sanjiangyuan, is a 400,000 km² area that serves as an important habitat for rich and unique biodiversity and a watershed of the three largest rivers in Asia, the Yellow, Yangtze and Mekong, which serve a billion people downstream. Dangwen isn’t officially a researcher or an activist. But he has taken upon himself the task of monitoring local wildlife with a team of other villagers, as part of a conservation proje...