A seagull flies over the Chengshanwei swan lake in Rongcheng city, east China's Shandong Province, Jan. 21, 2009. The Chengshanwei swan lake, located in the eastern part of the Jiaodong Peninsular, is the largest swan lake in northern China. Thousands of swans, wild gooses and widgeons migrate to the lake in the winters. [Jiang Fan/Xinhua]
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