Ducks are birds that feed and breedin areas where there is a lot of water, but their habitats have been shrinking in recent decades because of the droughts.
鸭子是在有大量水的地方觅食和繁殖的鸟类，但近几十年来，由于干旱，它们的栖息地一直在缩小。
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Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breedin the Arctic and are displacing birds of less vigorous species.