雪雁是种群居的鸟类。
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。
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.
在第4天，一切事物都齐全了：日出、风向和雪雁都出现在我的镜头前。
On the fourth day, everything fell together. The gorgeous sunrise, wind direction, and snow geese all took off right in front of my lens.
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