The Evolution of Locomotion in Mammals

It means that there is an independent coordination between the limbs. It's not like if you have a toy and all four limbs are operating on the same movement of a motor or something, so they're all doing exactly the same thing. And traditionally, it has been thought that these kinds of ways of moving round are mammalian. But we have some fish examples already. Crocodiles are also known to do a form of galloping, and as are known to bound, to kind of hop when they are trying to move fast. We see these a symmetrical gates in multiple groups. The old idea was that this showed up just a bit more than 200 million years ago when mammals showed up.

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