Huangshuihe Wetland Park in Longkou city, Yantai in East China's Shandong province is seeing more hustle and bustle than usual as flocks of whooper swans have migrated to the area to spend the winter, which is good evidence that the park's ecological system continues to improve.

Huangshuihe Wetland Park in Longkou city, Yantai in East China's Shandong province is a hot destination for various migratory birds. [Photo/Xuexi Qiangguo app]

A flock of whooper swans paddle across the water at Huangshuihe Wetland Park in Longkou city, Yantai in East China's Shandong province. [Photo/Xuexi Qiangguo app]

Huangshuihe Wetland Park offers a sound living environment, which attracts more and more swans to spend the winter each year. [Photo/Xuexi Qiangguo app]

Increasing numbers of whooper swans migrate to Huangshuihe Wetland Park, which indicates that the park's ecological system continues to improve. [Photo/Xuexi Qiangguo app]

A flock of whooper swans fly over the water at Huangshuihe Wetland Park in Longkou city, Yantai in East China's Shandong province. [Photo/Xuexi Qiangguo app]