如此广大的分布范围导致大量基因杂交现象的发生，在纯血统纳福牛下出现了许多纳福牛亚种，它们彼此之间的外貌差异相当大。

Such wide distribution has led to a broad genetic mix of races descended from mainline nerf stock, with subspecies looking quite different from one another.

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在动物杂交物种上，我们也发现了同样的现象。

The same phenomenon has been discovered in animal hybrids.

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几种不同的人类物种之间杂交是普遍现象吗？

Interbreeding Common Among Various Types of Humans?

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