Egrets are seen at the Ulunggur Lake National Wetland Park in Altay, northwest China's Xinjiang Uygur Autonomous Region, June 9, 2019. (Photos: Xinhua/Ding Lei)

A long-feet snipe forages at the Ulunggur Lake National Wetland Park in Altay, northwest China's Xinjiang Uygur Autonomous Region, June 9, 2019.

Wild birds fly over the Ulunggur Lake National Wetland Park in Altay, northwest China's Xinjiang Uygur Autonomous Region, June 9, 2019.

An egret is seen at the Ulunggur Lake National Wetland Park in Altay, northwest China's Xinjiang Uygur Autonomous Region, June 9, 2019.