Well, caterpillars probably do have 6 knees, but the things you're probably thinking of aren't legs. In this photo, the only legs are the brown ones holding the

Well, caterpillars probably do have 6 knees, but the things you're probably thinking of aren't legs. In this photo, the only legs are the brown ones holding the leaf; the things the caterpillar is standing on are prolegs, and they don't have joints: https://www.thoughtco.com/parts-of-a-caterpillar-1968482 https://www.thoughtco.com/parts-of-a-caterpillar-1968482