Sometime after 4 million years ago, ancient equid species began trotting across the Bering land bridge.

400 万年前某个时候，古老物种开始穿越白令陆桥。

Various ideas have been tossed around in the last 150 years about the African equids' stripes.

过去150年里，关于非洲动物身上条纹有各种各样观点。

Equines are the subfamily of equids that includes modern horses.

动物是包现代内动物亚。

And one of the most important likely descendants of Miohippus was an equid that was even better adapted to life on the plains: Parahippus.

Miohippus 最重要可能后代之一是一种更适应平原生活动物：Parahippus。

Bovids, equids and, in particular, canids, were put to work by H.sapiens; felids always took a slightly different view of the matter, but were indulged for their rodent-catching talents.

牛动物、动物，尤其是犬动物，都是由智人分工；猫动物略有不同，但受宠原因主要是捕捉啮齿类生物天性。

The study is in the journal Proceedings of the Royal Society B. Various ideas have been tossed around in the last 150 years about the African equids' stripes.

这项研究发表皇家学会学报 B 期刊上。过去 150 年里，人们对非洲条纹提出了各种不同看法。

For instance, the eight species of wild equids (horses and their relatives) vary greatly in disposition, even though all eight are genetically so close to each other that they will interbreed and produce healthy (though usually sterile) offspring.

例如，八种野生动物（及其近亲）性情差异很大，尽管所有八种野生动物基因上非常接近，以至于它们会杂交并产生健康（尽管通常不育）后代。