A ranger checks a truck passing the Altun Shan National Nature Reserve. At an average altitude of 4,500 meters, the reserve covers 45,000 square kilometers and is home to a variety of wild animals such as wild donkeys, Tibetan yaks, Tibetan gazelles and black-necked cranes. Few keepers, especially younger people, like to work in the remote area due to its harsh conditions. (Photo: China News Service/Wang Xiaojun)
