Swans swim on the Swan Lake in Rongcheng city of east China's Shandong Province on Nov. 20, 2007. The lake, an ideal winter habitat for swans, is attracting an increasing number of the migrants from Siberia to spend winter as the environment improves in recent years. (Xinhua Photo)
Swans fly over the Swan Lake in Rongcheng city of east China's Shandong Province on Nov. 20, 2007. (Xinhua Photo)
