Most species do their own evolving, making it up as they go along, which is the way Nature intended.
Terry PratchettPreston, I don't think this creature could ever find its way into your head. Quite apart from anything else, it seems pretty crowded and complicated to me.
Terry PratchettColon has always thought that heroes had some special kind of clockwork that made them go out and die famously for god, country and apple pie, or whatever particular delicacy their mother made. It had never occurred to him that they might do it because they'd get yelled at if they didn't.
Terry PratchettGranny bit her lip. She was never quite certain about children, thinking of them-when she thought about them at all-as coming somewhere between animals and people. She understood babies. You put milk in one end and kept the other as clean as possible. Adults were even easier, because they did the feeding and cleaning themselves. But in between was a world of experience that she had never really inquired about. As far as she was aware, you just tried to stop them catching anything fatal and hoped that it would all turn out all right.
Terry Pratchett