An egret flies at Ulungur Lake National Wetland Park in Fuhai County, northwest China's Xinjiang Uygur Autonomous Region, April 17, 2020. (Xinhua/Ding Lei)

A bird is seen at Ulungur Lake National Wetland Park in Fuhai County, northwest China's Xinjiang Uygur Autonomous Region, April 17, 2020. (Xinhua/Ding Lei)

Birds are seen at Ulungur Lake National Wetland Park in Fuhai County, northwest China's Xinjiang Uygur Autonomous Region, April 17, 2020. (Xinhua/Ding Lei)

Birds fly at Ulungur Lake National Wetland Park in Fuhai County, northwest China's Xinjiang Uygur Autonomous Region, April 17, 2020. (Xinhua/Ding Lei)

Cormorants rest at Ulungur Lake National Wetland Park in Fuhai County, northwest China's Xinjiang Uygur Autonomous Region, April 17, 2020. (Xinhua/Ding Lei)