A flock of black-faced spoonbills are seen at the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province, Nov. 8, 2020. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

An egret forages at the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province, Nov. 8, 2020. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

A flock of black-faced spoonbills are seen at the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province, Nov. 8, 2020. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

Photo taken on Nov. 8, 2020 shows a view of the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

Migration birds are seen at the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province, Nov. 8, 2020. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

Aerial photo taken on Nov. 8, 2020 shows a view of the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

A shrike forages at the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province, Nov. 8, 2020. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

Children draw pictures at the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province, Nov. 8, 2020. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

A mudskipper (L) and a fiddler crab fight on a mud flat at the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province, Nov. 8, 2020. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)

Aerial photo taken on Nov. 8, 2020 shows a view of the Minjiang River estuary wetland in Fuzhou, southeast China's Fujian Province. The estuary wetland is a major concentration area for migratory birds and habitat for waterfowls, including rare species. (Xinhua/Wei Peiquan)