Swans are seen in Chengshanwei swan lake in Rongcheng city, east China's Shandong Province, Feb. 10, 2010. The lake, an ideal winter habitat for migrant birds, attracted thousands of swans, wide geese and widgeons every year. (Xinhua/Jiang Fan)
A flock of swans swim in Chengshanwei swan lake in Rongcheng city, east China's Shandong Province, Feb. 10, 2010. The lake, an ideal winter habitat for migrant birds, attracted thousands of swans, wide geese and widgeons every year. (Xinhua/Jiang Fan)
A photographer takes pictures for a flock of swans in Chengshanwei swan lake in Rongcheng city, east China's Shandong Province, Feb. 10, 2010. The lake, an ideal winter habitat for migrant birds, attracted thousands of swans, wide geese and widgeons every year.
A swan flies over Chengshanwei swan lake in Rongcheng city, east China's Shandong Province, Feb. 10, 2010. The lake, an ideal winter habitat for migrant birds, attracted thousands of swans, wide geese and widgeons every year. (Xinhua/Jiang Fan)