Whooper swans in China's Gahai-Zecha National Nature Reserve
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A flock of whooper swans fly above water surface in Gahai-Zecha National Nature Reserve, west China's Gansu Province, Feb. 17, 2011. Whooper swans, wild birds under the second class state protection, usually migrant to the wetland from Siberia for wintering in north China region. [Xinhua/Gao Jianjun] |
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