Swans fly over a lake in Yandunjiao Village of Rongcheng City, east China's Shandong Province, Dec. 20, 2015. Thousands of migratory swans from Siberia converged in Rongcheng to spend winter. (Xinhua/Guo Xulei)
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Swans fly over a lake in Yandunjiao Village of Rongcheng City, east China's Shandong Province, Dec. 20, 2015. Thousands of migratory swans from Siberia converged in Rongcheng to spend winter. (Xinhua/Guo Xulei)
