Argali sheep forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)

Tibetan gazelles forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)

Tibetan gazelles forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)

Tibetan gazelles forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)

Argali sheep forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)

Tibetan gazelles forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)

Tibetan gazelles forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)

Tibetan gazelles forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)

Wild animals forage at Haltent Grassland in Kazak Autonomous County of Aksay, northwest China's Gansu Province, Nov. 30, 2019. (Photo by Ma Xiaowei/Xinhua)