A flock of bar-headed goose fly at Caohai National Nature Reserve in Weining County, southwest China's Guizhou Province, Nov.11, 2016. A good many migratory birds chose to live through winter at the Caohai Nature Reserve thanks to its well-preserved environment.Caohai Lake is the largest and most important wetland of southwest China, providing wintering place for black-necked cranes, the only plateau crane left in the world, and inhabited by more than 100 bird species.[China.org.cn/Photo by Yang Wenbin]

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