Do wombats really poop cubes? Yes, they are the only known animals that produce cube-shaped droppings.

• ✓Yang et al. 2019 — varying intestinal elasticity produces cubic wombat feces

Why is a wombat's poop shaped like a cube — and how does soft tissue make a perfect geometric solid? Wombats are the only known animals that produce cube-shaped droppings, formed by varying elasticity along the walls of their intestines. The intestine isn't rigid — it's flexible — yet it squeezes and releases in a way that creates flat faces and sharp edges, like nature's own die factory. Each wombat deposits up to a hundred of these cubes a night, stacking them on rocks and logs to mark territory. Because the cubes don't roll away, they stay exactly where the wombat placed them — a navigational trick that flat or round droppings simply can't pull off. No mold. No machinery. Just gut biology solving a geometry problem that stumped engineers for decades.