Swans in the Sanmenxia Wetland Park in Henan Province, Dec. 3, 2015. During winter, a large group of swans migrate from Siberia to the Yellow River Wetland in Sanmenxia City in Henan Province. With more efforts being made to protect the ecological conditions in the wetland, the number of swans that migrate here in winter is increasing. [Photo/Xinhua]
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