Wombats Are Nature's Only Square-Poop Makers

Wombats are chunky, burrowing marsupials from Australia, and they have exactly one superpower that no other creature on Earth can claim: they produce cube-shaped poop. Not vaguely boxy. Actual little cubes, about two centimeters on each side, stacked up near their burrows like tiny biological building blocks.

For a long time, scientists were stumped. Cubes don't exactly flow naturally through a cylindrical digestive tract — and yet, here we are. In 2021, researchers finally cracked the mystery and published findings on how wombat intestines have varying stiffness along their walls, which squeezes waste into its distinctive shape during the final stages of digestion. It's basically a biological pasta machine, but for something far less appetizing.

Why go to all that trouble? Wombats use their droppings to mark territory. Cubes don't roll away, so the little scent-markers stay exactly where the wombat left them — on top of rocks, logs, and other elevated spots. It's a surprisingly clever communication strategy, even if the medium is... unconventional.

The research on wombat digestion actually won an Ig Nobel Prize, the award that celebrates science that makes you laugh and then think. Which is, honestly, the best kind of science there is.