The number of bird species on islands today is almost exactly the same as it was prior to human colonization, but the species of birds on the islands are very different.

岛上今天鸟种类的数量几乎和人类定居之前完全一样，但是岛上鸟的种类则非常不同。

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Anatomists in the mid-1800s were fascinated by the underlying similarities of traits in different species - the fact that a bat's wing, for example, has all the same parts as a human hand.

十八世纪中叶的解剖学家们为不同物种之间潜在的相同特质所着迷。比如蝙蝠的翅膀就具有人类手掌的所有组成部分。

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However, the current limits are based on human use and limits for different species of animals probably would need to be different.

然而，目前通则中的限度是基于人类使用而设定的，不同种类动物的限度会有所不同。

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