Of all the poops worldwide, just wombats’ are formed like cubes.

The different flexibility of the wombat’s intestinal tracts assists the marsupials to shape their scat into cubelike nuggets, rather of the round pellets, untidy stacks or tubular coils made by other mammals, scientists reported November 18 at the American Physical Society Department of Fluid Characteristics conference in Atlanta.

Wombats mark their areas with little stacks of scat. Cuboid poops stack much better than rounder ones, and do not roll away as quickly.

However cubic shapes in nature are extremely uncommon, states mechanical engineer David Hu of Georgia Institute of Innovation in Atlanta. Making and keeping flat aspects and sharp corners takes energy. So it’s unexpected that the wombat’s intestinal tracts– which look just like those of any other mammal– would develop that shape.

When an Australian coworker sent out Hu and his coworker Patricia Yang the intestinal tracts from 2 roadkill wombats gathering frost in his freezer, “we opened those intestinal tracts up like it was Christmas,” Hu states.

The intestinal tracts were loaded with poop, Yang states. In human beings, a poop-filled little intestinal tract extends a little. In wombats, the intestinal tract extends to 2 to 3 times its routine width to accommodate all of the feces.