SANMENXIA, Dec. 3, 2017 - White swans are seen at a wetland in Sanmenxia, central China's Henan Province, Dec. 3, 2017. Migratory white swans fly from Siberia to spend the winter time in the wetland.

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Tourists take pictures of white swans at a wetland in Sanmenxia, central China's Henan Province, Dec. 3, 2017.

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