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

只有一个机会来取得雌芳心。

Evolutionary psychologists have argued that what we know today as KISSING may have come from kiss-feeding, the exchange of pre-chewed food from one mouth to another.Mother birds are famous for doing this.

进化心理学家认为我们今日所“接吻”可能是由“咀嚼喂养”而来，即将咀嚼食物从一方口中喂到另一方。雌正以此而闻名。

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

雌不接受雄确切原因还不太清楚。

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

但在类中，常只有当雌不在雄身边时候，才会发生无性繁殖。

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

战斗结束时雌们蹲伏下来，等待交配。

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芳心。

Birds make eggshells from materials from inside their hollow bones.

雌产卵以中空骨头里物质为材料。

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

他单身公寓干净整洁，很能吸引雌。

The mother bird flew about him with cries of anger. He used his gun as a club with which to hit her, but she flew beyond his reach.

雌大吵大叫地在他周围扑来扑去，他把枪当作棍子来打它，可是它闪开了。

The male birds wear their bright bold feathers to show the females how strong and healthy they are, so the females know they would make a good father.

雄明亮醒目羽毛向雌展示它们强壮与健康，这样雌就会道它们能成为一名好父亲。

Deep in the forest, a male superb bird of paradise struts his stuff for a rather drab female but she isn't the only one watching.

丛林深处一只极品雄性天堂向一只土土雌展示自己华丽羽毛，但她却不是唯一观众。

Well, when I measured the femur around — so particularly in this case it was a female — it was over a foot in circumference.

我测量了它股骨维度——特别是这次是只雌——其股骨周长超了 30 厘米。

And in the end one female became desperate enough and mated with the isolate founder, and then we had baby birds that imitated their father.

最终，有一只雌绝望了，和那只雄结合了，然后它们有了孩子，孩子开始模仿父亲。

So we're asking people to please be aware that females sing and to actually get a look at the bird that you're recording.

因此，我们请人们注意雌鸣叫现象，在录音时观察一下它们。”

The female signals her submission with open wings.

雌张开翅膀表示服从。

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对新奇事物偏好所驱动。

The researchers said they believe it is the first case of asexual reproduction in any bird species where the female had access to a mate.

研究人员表示，他们认为，这是类中第一例雌在有交配机会情况下进行无性繁殖。

He threw stones at her and by chance, one broke a wing. Then she ran away, dragging the broken wing, with him following her.

他投石子打它，碰巧打伤了它一个翅膀。雌拍击着受伤翅膀逃开了，他就在后面追赶。

Out on a golf course in Townsville, Australia, he's putting the final touches to his enormous bower, that he hopes will impress a visiting female.

澳大利亚汤斯维尔市高尔夫球场上，他正在为这座巨型凉亭做最后修饰，争取能够博得来访雌青睐。

And one of the reasons for that is that the females would have stored materials within those in order to make the eggs.

其中一个原因是，雌会在这些骨头中储存材料，以便制造蛋。