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Wombats Poop Cubes

https://www.smithsonianmag.com/smart-news/scientists-have-solved-mystery-how-wombats-poop-cubes-180976898/

To build on those results and fully understand how the wombats soft intestinal walls created sharp cube-like edges in the poop, Yang and her team dissected two wombats and examined the texture and structure of the intestinal tissue, reports Tess Joosse for Science. A 2-D mathematical model created from the wombats intestinal tract showed how the organ expanded and contracted during digestionand eventually squeezed out the excrement, reports Science.
A cross-section of the wombats intestine is like a rubber band with two ends kept slightly taut and the center section drooping. The rigid and elastic parts contract at different speeds, which creates the cube shape and corners, Patricia Yang tells Elena Debre for Slate.