亲缘关系相近的种被归入相同的属，然后很多属被归入到科，然后是目、纲、门，最后归入界(例如动物界)。

Groups of closely related species belong to the same genus, which in turn are clustered into families, then orders, then classes, then phyla, and finally into kingdoms (such as the animal kingdom).

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举例来说，在哥斯达黎加，两种亲缘关系最近的蛱蝶翅膀颜色是白色或者黄色，它们会根据颜色的不同“物以类聚”，进行配对。

For instance, in Costa Rica, the two most closely related species are white or yellow, which prefer to mate with those of their own color.

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但是上万种旧品种和野生亲缘则随着土地利用的改变，全球变暖以及随机因素自生自灭。

But hundreds of thousands of older varieties and wild relatives are left to the vagaries of land-use change, global warming and chance.

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