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

As the ice thaws, migratory birds return to Ulungur Lake in Xinjiang Uygur Autonomous Region, northwest China.

Substantial environmental improvements led to an increase in the number of birds coming here during the warmer months.

Birds at Ulungur Lake National Wetland Park, April 17, 2020. (Xinhua/Ding Lei)

Birds at Ulungur Lake National Wetland Park, April 17, 2020. (Xinhua/Ding Lei)

An egret flies at Ulungur Lake National Wetland Park, April 17, 2020. (Xinhua/Ding Lei)

Birds fly at Ulungur Lake National Wetland Park, April 17, 2020. (Xinhua/Ding Lei)

An egret flies at Ulungur Lake National Wetland Park, April 17, 2020. (Xinhua/Ding Lei)

A bird flies at Ulungur Lake National Wetland Park, April 17, 2020. (Xinhua/Ding Lei)