Jeff Layman wrote:

It's interesting that nature didn't come up with the wheel, one of the
most energy-efficient ways of moving around.

The wheel is the most natural phenomina in nature. The wheel has
existed since the creation of the universe... nothing is more natural
than the "orbit" (straight lines don't exist in this universe). The
wheel has always existed, man has only relatively recently
*discovered* the wheel. Anyone who thinks man invented the wheel is
the same kind of pinhead who thinks man invented fire.