Black-necked cranes fly over the Caohai national nature reserve in southwest China's Guizhou Province, March 9, 2018. Migratory birds began to fly northbound after wintering in Caohai. (Xinhua/He Huan)
Migratory birds fly northbound after wintering in SW China
Source: Xinhua| 2018-03-09 16:16:28|Editor: pengying
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