Changtang National Nature Reserve, a 4,500-meter-high wilderness in north of Xizang, is dubbed a "paradise for wildlife". It is a refuge for rare wild animals such as Tibetan antelope, wild yaks and Tibetan wild ass, somewhere they can survive and reproduce. The reserve is home to 10 national first-level protected wild animals and 21 national second-level protected wild animals. Since 2015, 73 wildlife conservation stations have been set up in Changtang, with a total of 780 conservation officers.