A picture taken by an infrared camera shows a snow leopard at the source region of the Yellow River in Northwest China’s Qinghai Province.(Photo provided to China News Service)

A picture taken by an infrared camera shows a wolf at the source region of the Yellow River in Northwest China’s Qinghai Province.(Photo provided to China News Service)

A picture taken by an infrared camera shows a lynx at the source region of the Yellow River in Northwest China’s Qinghai Province.(Photo provided to China News Service)

A picture taken by an infrared camera shows blue sheep at the source region of the Yellow River in Northwest China’s Qinghai Province.(Photo provided to China News Service)

A picture taken by an infrared camera shows white-lipped deers at the source region of the Yellow River in Northwest China’s Qinghai Province.(Photo provided to China News Service)