A covey of terns alighted on the Nautilus.

一群海燕落到诺第留斯号上面，被我们捕获了。

Why shoud I tern on a TV before I go to sleep.

为什么⼀定要在睡觉前打开呢。

It would be easy for the Anutans to over-harvest the noddy terns -even exterminate the colony.

白顶玄燕鸥是恩浮塔岛民最容易捕获的，甚至可以将其赶尽杀绝。

Back in 2010, an international research team fitted tracking devices to birds they believed to be special — Arctic terns.

早在 2010 年，一个国际研究小组就在他们认为很特殊的鸟类——北极燕鸥身上安装了跟踪设备。

Arctic terns begin their migration in the Northern hemisphere in the summer, which is breeding season.

北极燕鸥在夏季开始在北半球迁徙，这是繁殖季节。

It talks and makes picturs and I got to tern it on just before I go to sleep.

它会讲话也有图片，我要在睡觉前打开它。

This journey is a round-trip of up to 35,000km long, which makes the Arctic tern's migration the longest of any bird.

这一往返旅程长达 35,000 公里，这使得北极燕鸥的迁徙是所有鸟类中最长的。

Scientists are trying to boost the populations of three species: the bridled tern, brown noddy, and the Audubon's shearwater.

科学家们正试图增加三种物种的数量：白斑燕鸥、褐燕鸥和奥杜邦海鸥。

But one species, the arctic tern, flies to northern Europe all the way from the Antarctic. No animal on earth migrates this far.

而有一种鸟类，北极燕鸥，却从遥远的南极洲一路飞抵北欧，地球上没有任何动物能迁徙这么远。

Noddy terns. They've spent the day fishing out at sea, so it's only when they return to roost at night they can be caught.

白顶玄燕鸥，它们整天在海上捕鱼，所以只有它们在夜间归巢才捉得到。

With food so hard to come by in the open ocean, newly hatched sooty tern chicks are easy pickings for the larger frigate birds.

在海洋中寻找食物是如此的困难，刚出壳的乌燕鸥，对大一些的军舰鸟来说，就是垂手可得的食物。

But recent data from light-level geolocators show that terns actually travel more than twice as far each year, possibly to take advantage of prevailing winds.

但最近来自光级地理定位仪的数据显示，燕鸥实际上每年的旅行距离是原来的两倍多，可能是为了利用盛行风。

This means that arctic terns can rack up over 2 and a half million kilometers of flight in a lifetime — enough for three round trips to the moon.

这意味着北极燕鸥一生可以积累超过 250 万公里的飞行距离，足够三次往返月球。

Another marathon migrator, the Arctic tern, has long been credited with the longest migration for its annual round-trip flight between the Arctic and Antarctic — an estimated 40,000 km in total.

另一种马拉松式的迁徙者——北极燕鸥，因其每年在北极和南极之间的往返飞行而长期被认为是最长的迁徙——估计总共有4万公里。