A swan is pictured in the Sanggan River Nature Reserve in Datong, Shanxi province. As an important stopover point for migratory birds, the Sanggan River Nature Reserve recently welcomed a flock of white swans. [Photo/IC]

Swans fly over Datong, Shanxi province. The environment of Datong has been significantly improved in recent years, attracting more migratory birds. [Photo/IC]

Swans rest in the Sanggan River Nature Reserve in Datong, Shanxi province. [Photo/IC]