Male birds also have strange ornamentation on their skull.

雄鸟头上也有奇异的装饰。

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。

Researchers found that a large number of male birds appear to be learning tunes only used by other species.

研究人员发现很多雄鸟在学习其它物种的曲调。

Most male birds spend several months in their first year learning the songs they will sing for the rest of their lives.

大部分雄鸟在第一年会花费几个月时间学习它们以后的人生都要唱的情歌。

It's a kind of mostly-black bird, but it has white markings on it as well, and that's the male bird.

它是一种主要是黑色的鸟，但身上也有白色斑纹， 那就是雄鸟。

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.

雄鸟通过明亮醒目的羽毛向雌鸟展示它们的强壮与健康，这样雌鸟就会知道它们能成为一名好的父亲。

If you're looking at a bird you may say, " I can't tell a male bird from a female bird." Hopefully you won't have that problem with humans!

如果你在看一只鸟， 你可能会说，“我无法区分雄鸟和雌鸟。 希望你不会对人类有这个问题！