In the autumn of the Yellow River Delta in Dongying, Shandong, it's a festival for birds. Every migration season, millions of birds gather here, forming spectacular "bird waves". Some circle and dance in the sky, while others play and forage in the wetlands, like sprites of nature dancing freely in this wetland.

The Yellow River Delta in Dongying, Shandong, turns into a paradise of birds in autumn. [Photo/WeChat account: sdswltwx]