Evolution and the Evolution of the Animals

There's plenty of affinity between our basic perceptual structures and the basic perceptual structures of animals. You can take a human skull and just transform it, in terms of its morphology, into a chimp skull without very much problem at all. So so in any case, evolution is a conservative process. Once you have a once you have something that works well enough so that you can reproduce, you keep it and you tinker with it.