绿头鸭又叫做野鸭，是一种会依季节移栖的候鸟，冬天时飞向温暖的南方，夏天时再飞回北方的繁殖地进行繁殖。
The mallards are migratory birds sometimes called wild ducks. They fly to the warm South in winter, then return to the North in summer for breeding.
这些鸟夏季移栖到欧洲，冬季回到南方温暖的地方。
These birds migrate to Europe in the summer season, returning to warmer places in the south for the winter.
有些鸟会在冬天移栖到较温暖的地方。
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