Egrets rest on trees by the Sanya Lake in Sanya, south China's Hainan Province, Dec. 8, 2016. Water quality here has been improved since the local government began to control pollution a year ago. (Xinhua/Yang Guanyu)
Egrets rest on trees by the Sanya Lake in Sanya, south China's Hainan Province, Dec. 8, 2016. Water quality here has been improved since the local government began to control pollution a year ago. (Xinhua/Yang Guanyu)