Wombats Make the World's Only Cube-Shaped Poop

Meet the wombat: a chubby, bear-like marsupial from Australia that looks like it was designed by someone who had heard of a bear but never actually seen one. They're shy, surprisingly fast, and have one claim to fame that no other creature on the planet can match ? their poop is a perfect cube.

Yes, cube-shaped. With corners and everything. Wombats produce around 80-100 of these little brown bricks every single night, stacking them on rocks and logs to mark their territory. Flat sides stack neatly, which means the message stays put even on a windy night. Nature's most practical business card.

For years, scientists were baffled by the mechanics. How does any animal produce a geometric shape through a circular opening? The answer, published in 2018, turned out to be delightfully weird: wombat intestines have varying elasticity ? some sections stretch more than others ? which gradually molds the dropping into its distinctive cubic form over about 75 hours of digestion. No other known animal has intestines that work this way.

The research team that cracked this mystery was awarded an Ig Nobel Prize, the honor given to science that "first makes you laugh, then makes you think." Which is honestly a perfect summary of everything about wombats.