A ruddy shelduck and a flock of barhead geese fly over a wetland in Nyima County, southwest China's Tibet Autonomous Region, September 19, 2017. Changtang National Nature Reserve is a wildlife paradise and home to a variety of wildlife species such as Tibetan antelopes, wild yaks, Tibetan wild donkeys and black-necked cranes. (Photo by Zhang Rufeng/Xinhua/Barcroft Images)
