Birds forage at Nanhui Dongtan wetland in E China's Shanghai

A bird forages at Nanhui Dongtan wetland in Pudong, east China's Shanghai, March 31, 2024. (Xinhua/Wang Xiang)

A flock of birds fly above Nanhui Dongtan wetland in Pudong, east China's Shanghai, March 31, 2024. (Xinhua/Wang Xiang)

A flock of birds fly above Nanhui Dongtan wetland in Pudong, east China's Shanghai, March 31, 2024. (Xinhua/Wang Xiang)

Birds forage at Nanhui Dongtan wetland in Pudong, east China's Shanghai, March 31, 2024. (Xinhua/Wang Xiang)

A bird forages at Nanhui Dongtan wetland in Pudong, east China's Shanghai, March 31, 2024. (Xinhua/Wang Xiang)