An egret flies over the Zhanghe River in Northwest China's Gansu province. [Photo by Ma Tianyun]

Zhanghe River in Zhangxian county, Northwest China's Gansu province, has become a playground for flocks of birds that frolic in its waters.

In recent years, the county has continued to improve its urban and rural environments. Through systematic management and restoration, the river has attracted more birds to roost here.