Each may have just a single chance to impress a female.

只有一个机会来取得雌鸟芳心。

The exact reason females do not accept the males was not clear.

雌鸟接受鸟确切原因还太清楚。

But in birds, it usually only takes place when females are not around males.

但鸟类中，通常只有当雌鸟鸟身边时候，才会发生无性繁殖。

Warmer weather means the eggs of this female will have a chance of hatching.

温暖天气让这只雌鸟卵有机会孵化。

When it's over, females crouch and wait to be mated.

战斗结束时雌鸟们蹲伏下来，等待交配。

Birds make eggshells from materials from inside their hollow bones.

雌鸟产卵以中空骨头里物质为材料。

A male red bird-of-paradise, competing to attract a female by dancing.

一只红色性天堂鸟正用舞蹈来争取一只雌鸟青睐。

And now, he must hope a female hears his call.

现，必须期待雌鸟能听呼唤。

The female signals her submission with open wings.

雌鸟张开翅膀表示服从。

And for nightingales, it's the most elaborate song that apparently wins the day.

而至于夜莺，最精心准备歌曲无疑能够赢得雌鸟芳心。

One of these isolated males was added to a group of females to create a new finch colony.

接着将一只隔离后鸟放入雌鸟群中以期造一个新珍珠鸟群。

So it's crucial for a female bird to pick as a mate the most promising father—both genetically and behaviorally.

因此对雌鸟而言，管是基因角而行为角度择偶最为关键就是寻找一位最有前途父亲。

His bachelor pad is sufficiently neat and tidy to attract a female.

单身公寓干净整洁，很能吸引雌鸟。

And such virtuoso singing seems to signal the female that this is a guy she can count on.

而这样艺术大师无疑是向雌鸟发出这就是终身伴侣信号。

But the researchers also plan to test whether the new dialect's popularity is driven by a female preference for novelty.

但研究人员也计划进行测试，看看这种新方言流行是否是由雌鸟对新奇事物偏好所驱动。

The stage is now set for female visitors.

供雌鸟参观舞台已经准备就绪。

When he start singing his isolate unstructured song, they say " Yuk! " and they wouldn't go with him.

鸟鸣唱自己独创无序歌曲时，雌鸟们非常反感，予理睬。

This is not a female but a young male who hasn't yet developed that head crest.

这只是雌鸟，而是一只还没有长出羽冠鸟。

Ofer hoped that the females would find the male's call attractive enough that they would mate and create the next generation.

奥弗希望雌鸟能被鸟叫声吸引，这样它们就会结合生子。

I think the female bird is more sort of brown and beige.

我认为那只雌鸟更偏棕色和米色。