The count down to their autumn migration has already begun.

秋季的迁徙已经开始了倒计时。

The birds also tend to stop their migration following a full moon.

欧夜鹰在满月之后还倾向于停止迁徙。

Bianchi and his team tracked these ocean migrations with sonar data.

比安奇和他的团队利用声纳数据追踪大海中生物们的迁徙活动。

The result was a mass migration of the herbivores that consumed them.

其结果就是以它们为食的植食动物大规模迁徙。

In exchange, though, Tunisia has to help stem illegal migration to Europe.

不过，作为交换，突尼斯必须帮助阻止非法移民前往欧洲。

The other thing is in versus out migration.

另外一件要考虑的就是迁移。

We're also tackling illegal migration and stopping criminals from abusing our asylum system.

我们也在处理非法移民问题，阻止罪犯滥用我们的庇护制度。

These are migrations that have been compared to migrations on the Serengeti in Africa.

“这些迁徙可与非洲塞伦盖蒂平原上的大迁徙相提并论。

And migration today begets migration tomorrow, as new arrivals bring over children and partners.

而且今天的移民会带来明天的移民，因为新来的人会带来子女和伴侣。

This herd of over one hundred thousand makes the longest migration of any land animal.

这群十万之众的驯鹿迁徙的旅程是所有陆地动物中最长的。