Photo taken on March 31, 2019 shows melting ice in a river in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Hu Huhu)
Wildlife conservator Feng Jiang takes photos in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region, April 2, 2019. (Xinhua/Hu Huhu)
Kiangs are seen in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region, April 1, 2019. (Xinhua/Hu Huhu)
Aerial photo taken on April 2, 2019 shows a herd of kiangs in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Hu Huhu)
Kiangs are seen in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region, April 1, 2019. (Xinhua/Hu Huhu)
Wild yaks walk on a frozen lake in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region, March 31, 2019. (Xinhua/Hu Huhu)
Aerial photo taken on April 2, 2019 shows a herd of kiangs in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Hu Huhu)
Wild yaks are seen in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region, March 31, 2019. (Xinhua/Hu Huhu)
Ruddy shelducks fly in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region, April 2, 2019. (Xinhua/Hu Huhu)
Aerial photo taken on April 2, 2019 shows the half-frozen lake and wetland in the Altun Mountains National Nature Reserve in northwest China's Xinjiang Uygur Autonomous Region. (Xinhua/Hu Huhu)