Whooper swans soar through the sky in Rongcheng, Shandong province. [Photo by Lin Haizhen/dzwww.com]

A flock of swans forage for food, preen, and flap their wings along the coastline of Rongcheng, Shandong province. [Photo/iqilu.com]

Whooper swans glow in the morning sunlight in Rongcheng, Shandong province. [Photo/dzwww.com]

The healthy environment in Rongcheng is attracting an increasing number of whooper swans. [Photo/iqilu.com]