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

候鸟。

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

同时也为数以百万计的候鸟提供营养，这些候鸟可以在雷达上显示。

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

成为一座迷人的候鸟天堂。

The warm weather sees the arrival of migrant birds.

候鸟也随着温暖的天气回巢。

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

我乌纳拉斯卡候鸟办公室的执行董事。

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

我发现的鸟类典的新热带候鸟。

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

候鸟需要储存卡路里，为季末飞行做准备。

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

人在一些候鸟的眼睛里发现了隐色体。

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

北欧地区数百万候鸟的容身之地。

Another is that they rely on their sense of magnetism.

而其它则认为候鸟依赖的自身对磁场的感知。

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

它的东部沼泽，这里吸引了许多候鸟。

That growth was protected by the Migratory Bird Treaty Act.

这种增长受到《候鸟条约法》的保护。

Both types of birds were protected by the Migratory Bird Treaty Act.

这两种鸟类都受到候鸟条约法的保护。

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

她说，乌鸦被认为“部分候鸟”。

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

雪候鸟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，候鸟都会涌回它繁殖的地方。

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。

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

大约 20 万只候鸟在冬季飞往都昌，11 月候鸟迁徙的高峰期。

In 1917, the Canadian Parliament passed the Migratory Bird Convention Act.

1917年，加拿大议会通过了《候鸟协定法案》。

The park has been home to hundreds of thousands of birds that visit for the winter.

这个公园数十万只候鸟的家园。