Why Are Wombat Feces Cubic?
- 演化之聲
- 4 days ago
- 3 min read
The Australian bare-nosed wombat (Vombatus ursinus) is able to produce small, cube-shaped fecal pellets. At first glance, this seems like a curious and almost puzzling biological trick. Yet it raises a serious mechanical question: how can a soft intestine sculpt soft fecal material into a shape with flat faces and distinct corners?
Early explanations were largely speculative. Some suggested that the feces might be compressed into shape by the pelvic bones, while others imagined that wombats might have a square anal sphincter. Actual investigation, however, does not support these ideas. Computed tomography of a live wombat showed that the anus is round, as in other animals. Dissections also showed that the pelvic bones are not positioned close enough to the colon to mold feces into cubes. In other words, wombats do not make cubic feces by squeezing them through a geometric outlet. The shaping process begins earlier, inside the colon.
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