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Why do wombats poop cubes?

The Wombat’s Cube-Shaped Poop and the Physics Behind It - discoverwildscience

Wombats are out here defying the laws of physics by exclusively pooping out neat, geometric little cubes [1][2]. It turns out this isn't some weird digital glitch in the simulation, but the result of their 33-foot-long intestines having unevenly stretchy walls [3][4]. As the gut painfully slowly squeezes out every last drop of moisture over two weeks, alternating bands of tight and loose tissue mold the dry poop into sharp-cornered building blocks so they don't roll away down hills [5][6][7]. Basically, nature looked at geometry, said "watch this," and invented dice out of digested grass.

That unique shaping process leaves behind a whole trail of territorial business cards: