White swans fly over the Sanmenxia Swan Lake State Urban Wetland Park in Sanmenxia City, central China's Henan Province on Friday. Sanmenxia Swan Lake provides a serene, peaceful environment for the swans, which spend over five months here during the winter. /Xinhua Photo

With the arrival of the migratory white swans, Sanmenxia Swan Lake becomes a scenic spot at this time of year, as bird-watching season commences. /Xinhua Photo

The local government has said that it is taking all measures to ensure the safety and well-being of these precious birds. /Xinhua Photo