Rotating Locomotion in living systems: http://en.wikipedia.org/wiki/Rotating_locomotion_in_living_systems http://en.wikipedia.org/wiki/Rotating_locomotion_in_li

Rotating Locomotion in living systems: http://en.wikipedia.org/wiki/Rotating_locomotion_in_living_systems http://en.wikipedia.org/wiki/Rotating_locomotion_in_living_s... Technically they are apparently not wheels because the whole animal/plant rotates, but I'd argue that nature worked out the wheel principle just fine. In fact it seems an incredible cool solution to the problem that there aren't roads everywhere: the whole animal can transform from wheel form to walking form and back. It's almost like a biological Transformer (TM).