Particularly when they are engaged in other activities, like copulation, which requires coming partway out of the shell.

尤其是当它们忙于其他活动时，比如交配，需要它们的部分身体从壳里出来。”

The rituals displayed can convey reproductive fitness or they can just trick reluctant mates into copulation.

所展示的仪式以传达生殖力，也以只是欺骗不情愿的配偶进行交配。

For males, it might just be a few moments of copulation and that's it.

于雄性来说，只是短暂的交配，仅此而已。

(Laughter) Now, we define extra-pair copulation as the mating outside of a pair bond.

（笑）现在，我们将外配交配定义为配关系之外的交配。

For example, the fact that I am really outgoing and I'm not shy talking about sex and copulation and things like that.

例如，我真的很外向，而且我并不害羞地谈论性和交配之类的事情。

It originates from the copulation of the dragon and the tiger.

它源自龙虎交合。

This act of copulation, fertilization perhaps, which should have been no more to me than a bee is to a flower, had become for me indecorous, an embarrassing breach of propriety, which it hadn't been before.

种交配、受精的行为，也许我而言，就像蜜蜂一朵花一样，我来说已经变得不雅，一种令人尴尬的违反礼仪的行为，在以前是没有的。

Basically, in the 80s, scientists discovered that songbirds were more polyamorous than expected, and it turned out that this phenomenon called extra pair copulation, or EPC, was behind the questionable parentage of many baby birds.

基本上，20世纪80年代， 科学家们发现鸣禽的“一夫多妻” 现象比预想的更为普遍，结果表明，种被称为“额外配交配”（简称EPC）的现象， 正是许多雏鸟身世存疑的幕后原因。