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Migratory swans spend winter at central China's wetland

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans fly over a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)

  Swans are seen at a wetland in Sanmenxia City, central China's Henan Province, Nov. 17, 2018. Thousands of migratory swans flied here to spend winter at Sanmenxia Yellow River wetland. (Xinhua/Zhu Xiang)