Snow geese are very gregarious birds.

雪雁是种群居的鸟类。

《柯林斯英汉双解大词典》

Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.

某些种类的北极鸟受到近来雪雁数量急剧增加的威胁，这些雪雁在北极繁殖，并且正在取代生命力较弱的鸟类。

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Snow geese travel thousands of miles to their winter homes.

雪雁飞行数千英里去它们冬天的家。

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Indeed, the population of snow geese in the north has recently grown dramatically, and one study suggests that the abundance of goose nests could offset some of the nutrients lost because of a shorter seal-hunting season.

WSJ: Are Polar Bears Really Disappearing?