Even though modern genetics might be deflating our romantic notions about lovebirds, from a biological standpoint, pairing up with one individual and then copulating with others on the side makes a lot more sense than absolute sexual loyalty.

尽管现代遗传学可能会让我们对爱情鸟的浪漫概念嗤之以鼻，但从生物学的角度来看，与一个个体配对，然后再兼与其他个体交配，比绝对的性忠诚更有意义。

There's not an animal on this planet that will copulate with anything that comes along.

世界上任何一种动物都不会饥不择食地寻找活物进行交配。

But for male birds, music is actually part of a testosterone-fueled mating ritual.

但是对于雄鸟而言，歌声实际上只是由雄性激素引发交配仪式的一部分内容。

This rabbit had no natural enemies in the Antipodes, so that it multiplied with that promiscuous abandon characteristic of rabbits.

这种兔子在澳大利亚及新西兰没有天敌，因此便以兔子所特有的杂乱交配迅猛繁殖起来。

When he finds one, he alights and mates.

当它找着了，就降落下来交配。

Mayflies come out of rivers or streams where they develop to mate.

蜉蝣从河流或溪流中孵化出来进行交配。

No one has reported seeing narwhals eat or mate underwater.

从来没有人目睹独角鲸在水下进食或交配。

Everything from their social behavior to their mating habits, to where they give birth is a mystery and scientists also don't know why they occasionally attack humans.

无论是社会行为还是交配习惯一切都不得而知，就连在哪出生都是个谜，而且学家也不知道为何大白鲨会时常袭击人类。

They lived in open polyamorous communities where food was exchanged for sexual favors, because females could collect food, fruits, nuts and insects while still caring and protecting their babies.

他们生活在一种开放的多角恋群体中，在这里通过食物就可以换取交配权，因为女性可以采集食物，如水果、坚果、昆虫，同时还可以照顾保护自己的孩子。

They come together to mate in spring and early summer.

他们在春天和初夏才聚在一起进行交配。

From an evolutionary perspective getting out there and mating would increase the odds of predation.

从进化的角度来看，外出交配会增加被捕食的几率。

They mate, they lay eggs and they die.

它们交配、产卵，然后死亡。

And that's the sound of the mating call so they can respond to us.

这是交配的声音信号，这样它们就会对我们做出回应。

Hares have long been thought to behave excitedly in March, which is their mating season.

人们一直认为野兔在三月会变得兴奋异常，因为三月是它们的交配季。

Laysan albatrosses mate for life. They lay one egg a year.

黑背信天翁一生只与一名伴侣交配。每年只产一枚蛋。

As the rains arrive, they emerge to mate.

当梅雨降临，它们开始交配。

It's also important the embryos have no inbreeding – breeding of a young animal from two closely related parents, because this can cause disease.

同样重要的是，该胚胎不是近亲交配而来，近亲交配指的是幼仔由亲缘关系密切的父母繁殖而来，因为近亲交配可能导致疾病。

For instance, if women find taller men more attractive, then more tall men would mate and have children, putting more tall genes in the gene pool.

比如说，如果女性发现长得高的男性更具吸引力，然后更多高大男人会交配生子，基因库中就会有更多的高大基因。

It has been a... challenging mating season for Birdperson.

鸟人的交配季真是 不容易啊。

All but one successfully mated and defended their territories.

除一只鸟外，所有鸟儿均成功交配并保卫了自己的领土。