It's gonna cover the cost of that t-bird.

刚好够我买下那辆。

A Rock Ptarmigan might make a tasty snack.

可能成为可口的小吃。

The Ptarmigan is a master of disguise.

伪装的高手。

But, like, a lot bulkier and more robust.

不过，更庞大，更结实。

The largest are the thunderbirds called Dromornis stirtoni.

最大的一种叫 Dromornis stirtoni。

It's one of the few birds to remain inland during the freeze.

冰冻季节仍留在内陆的少数类之一。

They're not flying. Their closest living relatives are ducks and geese.

不会飞。它们现存的近亲鸭和鹅。

But in big bird circles, you'll hear them called thunderbirds.

但在大型类圈里，它们被称为“”。

This is paleontologist and thunderbird expert Trevor Worthy.

这古生物学家和专家特弗·沃西。

Thunderbirds lived in Australia, and they had a long run.

栖息在澳大利亚，可以长距离奔跑。

And there was one thunderbird that was more thunderous than the rest.

有一只的声音比其他的都要响亮。

And life did get tough for thunderbirds.

的生活确实变得艰难了。

Trevor says the thunderbirds' vegetarian diet might partly explain their size.

特弗说，的素食饮食可能其大体型的原因之一。

Consider the emu, a different big bird that lived alongside the thunderbirds.

鸸鹋与一起生活的另一种大型类。

This one goes to the Thunderbirds at Zia Middle School, bringing the Thunder from Las Cruces, New Mexico.

向齐亚中学的队大声致意，从新墨西哥州拉斯克鲁塞斯带来霆队吧。

And while the thunderbirds went extinct, the emu survived.

虽然灭绝了，但鸸鹋却活了下来。

Another example is the bird Rock ptarmigan which has brown feathers during the summer and white during the winter.

另一个例子，在夏季时棕色的羽毛， 而在冬季呈现白色。

She's talking about the dromornithids. That's their scientific name. But in big bird circles, you'll hear them called thunderbirds.

她说的啸。这它们的学名。但在大圈，你会听到它们被称为。

But this can be a riskier strategy when life is tough. And life did get tough for thunderbirds.

但当生活艰难时，这可能一个风险更大的策略。的生活确实很艰难。

Their big body probably helped them in other ways, too.

庞大的身体可能也在其他方面帮助了它们。