Swans are seen on the Swan Lake in Rongcheng of east China's Shandong Province, Nov. 22, 2010. The lake, which is an ideal habitat for swans in winter, attracts thousands of swans from Siberia every year to spend winter. (Xinhua)

Swans float on the Swan Lake in Rongcheng of east China's Shandong Province, Nov. 22, 2010. The lake, which is an ideal habitat for swans in winter, attracts thousands of swans from Siberia every year to spend winter. (Xinhua)

A swan waves wings on the Swan Lake in Rongcheng of east China's Shandong Province, Nov. 22, 2010. The lake, which is an ideal habitat for swans in winter, attracts thousands of swans from Siberia every year to spend winter. (Xinhua)

A swan flies near a boat on the Swan Lake in Rongcheng of east China's Shandong Province, Nov. 22, 2010. The lake, which is an ideal habitat for swans in winter, attracts thousands of swans from Siberia every year to spend winter. (Xinhua)

Swans frolic on the Swan Lake in Rongcheng of east China's Shandong Province, Nov. 22, 2010. The lake, which is an ideal habitat for swans in winter, attracts thousands of swans from Siberia every year to spend winter. (Xinhua)

Swans are seen on the Swan Lake in Rongcheng of east China's Shandong Province, Nov. 22, 2010. The lake, which is an ideal habitat for swans in winter, attracts thousands of swans from Siberia every year to spend winter. QQQwww.Chinakindnesstour.com