Over 1,000 black-necked cranes in Dashanbao National Nature Reserve started migrating north. The nature reserve lies in Zhaotong City of southwest China's Yunnan Province.

Dashanbao is a major habitat for black-necked cranes in China. After wintering here for four months, the birds will go on to breed in Ruo'ergai Grassland of southwest China's Sichuan Province.

The migration started on March 16, and the number of the flock reached its peak on March 20, according to the nature reserve authority. The black-necked cranes are expected to finish migrating before the end of April, according to the nature reserve.

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