<s>[INST] Why don't animals have wheels? Answer as briefly as possible. [/INST] Mechanistically because wheels are a human invention, and only a few animals have been invented by human. In general current modern technology is quite bad mergine biological and mechanical components in a way that is consistent with the animal's fitness curve. If by having wheels you mean only figuratevely, then domestic animals often have prostetic wheels as a consequence of surgeries and congenital problems which serverly impair their deambulation ability.</s>\ <s>[INST] Why did evolution never come up with wheels instead of legs? [/INST] Evolution is a process that occurs over millions of years and is driven by the survival and reproduction of organisms that have certain advantageous traits. The development of wheels as a means of locomotion would have required significant changes to the anatomy and physiology of animals, and it is possible that legs, which are a more versatile form of locomotion, were more advantageous for the survival and reproduction of ancestral species. Additionally, the development of wheels would have also required a hard surface to roll on, which may not have been available in many environments where early animals lived.</s>