Bar-headed geese and black-necked cranes are seen on the Caohai Nature Reserve in Weining county of Bijie city, Southwest China's Guizhou province, Mar.5, 2016. Caohai 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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