Migrant birds fly in the Dongzhaigang National Nature Reserve in south China's Hainan Provine, Dec. 21, 2016. About 7,000 migrant birds arrived here to pass the winter recently. (Photo: Xinhua/Yang Guanyu)
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Migrant birds fly in the Dongzhaigang National Nature Reserve in south China's Hainan Provine, Dec. 21, 2016. About 7,000 migrant birds arrived here to pass the winter recently. (Photo: Xinhua/Yang Guanyu)
