Wombats are the only known animals that produce cube-shaped poop.

And we're not talking about something vaguely square. Their droppings can emerge as surprisingly well-defined little cubes.

Scientists were puzzled by this for years. After all, wombats don't exactly come equipped with square plumbing.

Somehow, a soft biological system produces something that looks almost manufactured.

And the way a wombat does it is stranger than the cubes themselves.