White cranes are seen at the Poyang Lake in east China's Jiangxi Province, Jan. 11, 2018. Poyang Lake is Asia's largest wintering habitat for migratory birds. Hundreds of thousands of birds winter here every year. (Xinhua/Wan Xiang)

White cranes are seen at the Poyang Lake in east China's Jiangxi Province, Jan. 11, 2018. Poyang Lake is Asia's largest wintering habitat for migratory birds. Hundreds of thousands of birds winter here every year. (Xinhua/Wan Xiang)

White cranes are seen at the Poyang Lake in east China's Jiangxi Province, Jan. 11, 2018. Poyang Lake is Asia's largest wintering habitat for migratory birds. Hundreds of thousands of birds winter here every year. (Xinhua/Wan Xiang)

White cranes are seen at the Poyang Lake in east China's Jiangxi Province, Jan. 11, 2018. Poyang Lake is Asia's largest wintering habitat for migratory birds. Hundreds of thousands of birds winter here every year. (Xinhua/Wan Xiang)