The Coa Valley provides a migratory corridor for rare species.

科阿山谷为稀有物种提供了迁徙道。

And migratory birds that extend their visits may provide competition for some avian natives.

同时，逗留时间更长的候鸟也可能对一些本土鸟产生竞争。

Desert locusts are the world's oldest and most destructive migratory pest.

沙漠蝗虫是世界上最古老和最具破坏性的迁徙害虫。

The manta rays include one species that lives near reefs and another that's migratory.

蝠鲼是包括在其中生活在礁附近的一个物种, 而另一种则有迁居习惯。

The Coa Valley provides a migratory corridor for rare species.

科阿山谷为稀有物种提供了迁徙道。

Temperatures begin to cool and migratory birds set off on their southward journeys.

气温渐凉，候鸟踏上南迁的旅程。

For several months until mid-November it recorded the night-time calls of migratory birds flying above.

在11中旬之前的几个里，它记录了夜间鸟类迁徙时在空中飞行的叫声。

So researchers analyzed six years of barnacle goose migratory tracking data.

因此，研究人员对白颊黑雁六来的迁徙追踪数据进行了分析。

A more exact count could help salvage a migratory wonder.

更准确的统计可能有助于挽救一个迁徙奇迹。

Every spring, migratory birds flood back to where they breed.

每春天，候鸟都会涌回它们繁殖的地方。

They're currently endangered after a big drop in their migratory population.

黑脉金斑蝶目前濒临灭绝，这是由于它们迁徙的数量大幅减少。

Duffy-Anderson said large fish are often highly migratory.

达菲-安德森说，大型鱼类常是高度洄游的。

People liked eating the migratory birds, and they disappeared from Europe.

人们喜欢吃候鸟，于是它们就从欧洲消失了。

Most migratory species travel at night, when lights near buildings can distract or disorient them.

大多数候鸟在夜间飞行，那时建筑物附近的灯光会分散它们的注意力或使它们迷失方向。

Cryptochrome has been found in the eyes of several migratory birds.

人们在一些候鸟的眼睛里发现了隐色体。

One of the two flycatcher subspecies is migratory. The other stays put.

两种王霸鶲亚种中，一种是迁徙性的。另一种则待在原地。

The Nordic countries provide a home to millions of migratory birds.

北欧地区是数百万候鸟的容身之地。

Remember the 70 percent of North American birds that are migratory?

还记得北美 70% 的鸟都是候鸟吗？

But also that scale is shrinking as migratory bird populations decline to record low numbers.

但随着候鸟数量下降至历史低点，迁徙规模也在缩水。

Their culture has evolved around the migratory needs of the herds.

他们的文化是围绕着鹿群的迁徙需要而发展的。