Swans are seen at the East Lake in Jiujiang County, east China's Jiangxi Province, Nov. 7, 2012. Swans migrate here in late autumn and early winter to live through the winter. (Xinhua/Yang Jihong)

Swans are seen at the East Lake in Jiujiang County, east China's Jiangxi Province, Nov. 7, 2012. Swans migrate here in late autumn and early winter to live through the winter. (Xinhua/Yang Jihong)

Swans are seen at the East Lake in Jiujiang County, east China's Jiangxi Province, Nov. 7, 2012. Swans migrate here in late autumn and early winter to live through the winter. (Xinhua/Yang Jihong)

Swans are seen at the East Lake in Jiujiang County, east China's Jiangxi Province, Nov. 7, 2012. Swans migrate here in late autumn and early winter to live through the winter. (Xinhua/Yang Jihong)