People take photos of swans in a wet land in Pinglu, north China`s Shanxi Province, Nov. 13, 2011. (Xinhua/Xue Jun)

Photo taken on Nov. 13, 2011 shows swans in a wet land in Pinglu, north China`s Shanxi Province. (Xinhua/Xue Jun)

Photo taken on Nov. 13, 2011 shows swans swimming in a wet land in Pinglu, north China`s Shanxi Province. (Xinhua/Xue Jun)