Migratory swans flock to Yellow River wetland in Sanmenxia to spend winter

An aerial drone photo taken on Dec. 20, 2025 shows people viewing swans at a wetland in Sanmenxia, central China's Henan Province. A large number of migratory swans have flocked to the Yellow River wetland in Sanmenxia to spend winter. (Photo by Liu Xiaokun/Xinhua)