- They winter along the Gulf of Mexico, and in spring they fly the entire length of North America to reach the Arctic tundra.
它们在墨西哥湾越冬 等到春天便一路飞过北美洲 来到这里的北极苔原 - Five million birds make this journey every year.
每年有五百万只雪雁都是这样迁徙 - Their marathon migration is almost 3,000 miles long
这场马拉松式的迁徙长达三千英里 - and has taken them three months.
耗时多达三个多月 - Exhausted and starving, they touch down inside the Arctic Circle,
虽然早己精疲力竭 饥肠辘辘 但它们终于返回了北极圈 - back at their traditional breeding grounds at last.
返回了它们阔别已久的繁殖地 - Snow geese pair for life.
雪雁一生只忠于一个配偶
and has taken them three months. 耗时多达三个多月
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