A group of swans rest at a wetland along the Yellow River in Sanmenxia, Central China's Henan province, Dec 20, 2011. Thousands of white swans migrate to the wetland from Siberia to spend winter every year. [Photo/Xinhua]
White swans from Siberia rest at a wetland in Sanmenxia, Dec 20, 2011. [Photo/Xinhua]
