Wombats make cube-shaped poop with their intestines.
Why this sounds fake
Cubes feel like manufactured objects with molds and edges, not something a soft mammal gut should produce.
Cube shapes sound manufactured. Mammal waste should be round pellets, tubes, or piles, not neat little blocks. Wombats are the exception. Research on wombat intestines found regions with different stiffness that help shape dry feces into flat faces and corners as it moves through the final part of the gut. The anus is not a square mold. The shape emerges from dehydration, pressure, and uneven intestinal elasticity over many contractions. The result is one of the cleanest Wait... Really? biology facts: a soft organ can repeatedly manufacture a geometric solid.
The diagram restores the mechanism: alternating stiff and soft bands shape the pellet before it exits.
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