The Animal That Poops Perfect Cubes

Somewhere in the Australian outback, a wombat is going about its business ? and its business is genuinely extraordinary. Wombats are the only known animals in the world that produce perfectly cube-shaped droppings. Not approximately cube-ish. Actual, stackable, six-sided geometric cubes. Of poop.

For years, scientists assumed the wombat must have some kind of square-shaped internal tube. It does not. Researchers eventually discovered that the secret lies in the uneven elasticity of the wombat's intestinal walls. Different sections stretch at different rates, gradually coaxing the waste into corners over the final stretch of its long digestive journey (which takes an impressive two to three weeks, by the way).

Why cubes? Wombats use their droppings to mark territory, often stacking them on rocks and logs like tiny brown signposts. A cube is far less likely to roll away than a sphere. Evolution, in its infinite creativity, essentially invented the non-rolling poop as a practical real-estate tool. Nature is breathtaking.

As a bonus: a single wombat can produce up to 100 of these geometric marvels per night. Which makes the wombat, pound for pound, the most productive cube manufacturer on the planet ? and the only one doing it completely for free.