<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] Which animals have been invented by humans? [/INST] Humans have affected the evolutionary path of some animals through artificial selection. For example Dog breeding is a prime example of artificial selection. Although all dogs are descendants of the wolf, the use of artificial selection has allowed humans to drastically alter the appearance of dogs.</s>