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Where did the swans at Sanjiangkou in Lanzhou come from?

Siberia. There are many white swans at Sanjiang Estuary in Dachuan, Lanzhou every year. After long-distance migration from distant Siberia, they come here to live and overwinter. The swan is shaped like a goose and has a larger body. It is white all over. Its upper bill is divided into yellow and black parts. Its feet and tail are short. Its feet are black and webbed. It is a migratory bird of the Anatidae family and the genus Swan.