例如，四趾的始祖鸟先于三趾的始祖鸟出现，但北美的化石证据表明，这两种动物之间有一个急促而不均衡的转换过程。

The four-toed Eohippus preceded the three-toed Miohippus, for example, but North American fossil evidence suggests a jerky, uneven transition between the two.

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四趾向前的足趾向前方长的。

Having all toes pointing forwards. Used of certain birds.

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这些鸟闻名于它们大声的咯咯声，四趾的脚和鲜艳的羽毛。

These birds are best known for their loud cackles, four-toed feet, and brilliant plumage.

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