Swans fly over the Beidagang Wetland in Tianjin, north China, Nov. 1, 2016. About 2,000 migrating swans gathered in the wetland for rest, according to volunteers for birds protection. (Xinhua/Yue Yuewei)
Swans fly over the Beidagang Wetland in Tianjin, north China, Nov. 1, 2016. About 2,000 migrating swans gathered in the wetland for rest, according to volunteers for birds protection. (Xinhua/Yue Yuewei)