Tibetan antelopes are seen on a grassland in Shuanghu County of Nagqu, southwest China's Tibet Autonomous Region, Oct. 21, 2019. Located in the hinterland of China's Tibet, Shuanghu County of Nagqu City is the world's highest county-level district with an average elevation of 5,000 meters. (Photos: Xinhua)

A flock of Tibetan gazelles are seen on a grassland in Shuanghu County of Nagqu, southwest China's Tibet Autonomous Region, Oct. 20, 2019. Lies within the Qiangtang National Nature Reserve, Shuanghu County has a large area of glaciers and lakes. It's various landscapes had made it an ideal habitat for different endangered wild animals to live and breed.

Tibetan antelopes are seen on a grassland in Shuanghu County of Nagqu, southwest China's Tibet Autonomous Region, Oct. 20, 2019.

A group of kiangs (Equus kiang) graze on a grassland in Shuanghu County of Nagqu, southwest China's Tibet Autonomous Region, Oct. 20, 2019.

A wild yak is seen on a grassland in Shuanghu County of Nagqu, southwest China's Tibet Autonomous Region, Oct. 21, 2019.

Tibetan antelopes forage on a grassland in Shuanghu County of Nagqu, southwest China's Tibet Autonomous Region, Oct. 21, 2019.

A wolf is seen on a grassland in Shuanghu County of Nagqu, southwest China's Tibet Autonomous Region, Oct. 20, 2019.