migratory species
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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.
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