A stunning "bird wave" spectacle unfolded over the wetlands of the Yellow River Delta National Nature Reserve in Dongying, East China's Shandong province.

Tens of thousands of geese and ducks soared into the sky, swirling, scattering, and reforming in mesmerizing patterns, like ever-changing sand art.

This "bird wave" occurs when birds fly together in coordinated groups to reduce predation risks and improve foraging efficiency. The phenomenon is most common during the peak migratory periods in spring and late autumn as waterfowl prepare for their journeys by building strength.

With the wetlands' ecological restoration in recent years, the Yellow River Delta's "bird wave" has gained nationwide attention, drawing photographers from across the country. The sight of countless cameras capturing the majestic flocks adds enthusiasm to estuary's winter landscape.

Tens of thousands of birds rise in unison, creating a breathtaking "bird wave" that ripples across the sky like living art. [Photo/VCG]

The mesmerizing formation of swirling bird flocks paints the wetlands' sky in graceful, ever-changing patterns. [Photo/VCG]

A dense flock of birds transforms the sky into a dynamic canvas, showing the magic of the "bird wave" phenomenon. [Photo/VCG]

Layers of "bird waves" roll through the air, blending harmony and chaos in nature's spectacular display. [Photo/VCG]