Whooper swans in China's Gahai-Zecha National Nature Reserve
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A whooper swan drinks water at Gahai-Zecha National Nature Reserve, northwest 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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