White swans fly from Siberia to Yellow River wetland to spend winter

A white swan wearing a track collar is seen at the Yellow River wetland in Sanmenxia, central China's Henan Province, Nov. 22, 2018. White swans have flown from Siberia to the Yellow River wetland to spend winter. Measures have been taken to protect these migratory swans. (Xinhua/Zhu Xiang)