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The elasticity of wombats’ intestines helps to shape their distinctive poops
Of all the poops in the world, only wombats’ are shaped like cubes.
The varied elasticity of the wombat’s intestines helps the marsupials to sculpt their scat into cubelike nuggets, instead of the round pellets, messy piles or tubular coils made by other mammals, researchers reported November 18 at the American Physical Society Division of Fluid Dynamics meeting in Atlanta.
Wombats mark their territories with small piles of scat. Cuboid poops stack better than rounder ones, and don’t roll away as easily.
But cubic shapes in nature are very unusual, says mechanical engineer David Hu of Georgia Institute of Technology in Atlanta. Making and maintaining flat facets and sharp corners takes energy. So it’s surprising that the wombat’s intestines — which look much like those of any other mammal — would create that shape.
When an Australian colleague sent Hu and his colleague Patricia Yang the intestines from two roadkill wombats collecting frost in his freezer, “we opened those intestines up like it was Christmas,” Hu says.
The intestines were packed with poop, Yang says. In humans, a poop-filled bit of intestine stretches out slightly. In wombats, the intestine stretches to two to three times its regular width to accommodate all of the feces.
Yang used skinny balloons — the type that gets sculpted into animals at carnivals — to inflate the intestines and measure their stretchiness in different places. Some regions were more stretchy; some were stiffer. The stiffer regions probably help create the distinct edges on the wombat poops as the waste moves through the gut, Yang proposes.
Of all the poops in the world, only wombats’ are shaped like cubes.
The varied elasticity of the wombat’s intestines helps the marsupials to sculpt their scat into cubelike nuggets, instead of the round pellets, messy piles or tubular coils made by other mammals, researchers reported November 18 at the American Physical Society Division of Fluid Dynamics meeting in Atlanta.
Wombats mark their territories with small piles of scat. Cuboid poops stack better than rounder ones, and don’t roll away as easily.
But cubic shapes in nature are very unusual, says mechanical engineer David Hu of Georgia Institute of Technology in Atlanta. Making and maintaining flat facets and sharp corners takes energy. So it’s surprising that the wombat’s intestines — which look much like those of any other mammal — would create that shape.
When an Australian colleague sent Hu and his colleague Patricia Yang the intestines from two roadkill wombats collecting frost in his freezer, “we opened those intestines up like it was Christmas,” Hu says.
The intestines were packed with poop, Yang says. In humans, a poop-filled bit of intestine stretches out slightly. In wombats, the intestine stretches to two to three times its regular width to accommodate all of the feces.
Yang used skinny balloons — the type that gets sculpted into animals at carnivals — to inflate the intestines and measure their stretchiness in different places. Some regions were more stretchy; some were stiffer. The stiffer regions probably help create the distinct edges on the wombat poops as the waste moves through the gut, Yang proposes.
