Swans are seen flying in the morning sunlight above a lake in Rongcheng city, Shandong province, Nov 4, 2018. The swans, which have migrated here to spend the winter, make a lively addition to the tranquil scene. [Photo/Xinhua]

Swans are seen flying in the morning sunlight above a lake in Rongcheng city, Shandong province, Nov 4, 2018. The swans, which have migrated here to spend the winter, make a lively addition to the tranquil scene. [Photo/Xinhua]