They even had an affectionate nickname, " uccelli di passaggio, " birds of passage.

候。

It also provides nutrients to millions of migrating birds that can show up on radar.

同时也为数以百万计候提供营养，这些候可以在雷达上显示。

The warm weather sees the arrival of migrant birds.

候也随着温暖天气回巢。

Another is that they rely on their sense of magnetism.

而其它则认为候依赖身对磁场感知。

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

气温渐凉，候踏上南旅程。

And I am the Unalaska Visitor's Bureau executive director.

我乌拉斯卡候办公室执行董事。

Some 200,000 migratory birds fly to Duchang during winter, with the peak migratory season falling in November.

大约 20 万只候在冬季飞往都昌，11 月候高峰期。

The birds that we find are typically neo-tropical migrants.

我们发现类典型新热带候。

Migrating birds need to store calories to prepare for their end-of-season trips.

候需要储存卡路里，为季末飞行做准备。

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

人们在一些候眼睛里发现了隐色体。

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

北欧地区数百万候容身之地。

To the east of those is the marsh area which attracts a great many migrant birds.

它们东部沼泽，这里吸引了许多候。

Crows, she says, are what's known as partial migrants.

她说，乌鸦被认为“部分候”。

On top of this, many migrating birds are land-lubbers at heart.

最重要，许多候本质上陆。

It turns this remote area into a fascinating paradise for these migrant birds.

成为一座迷人候天堂。

Snowbirds flee northern states in the winter for the South or Southwest.

雪候冬天从北部各州逃往南部或西南地区。

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

每年春天，候都会涌回它们繁殖地方。

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

人们喜欢吃候，于它们就从欧洲消失了。

Migrants encounter fewer predators at night.

候在夜晚遇到捕食者较少。

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

同时，逗留时间更长候也可能对一些本土产生竞争。