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Why is wombat excreta shaped like cubes?

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up vote 19 down vote favorite I've heard that wombat excreta is cube shaped, but I don't understand how that can happen. Has anyone studied the phenomenon? What would the evolutionary pressure have been to cause this? zoology physiology ethology mammals digestion share | improve this question edited Nov 19 at 23:08 David 11.4k 4 17 47 asked Nov 19 at 22:19 ASimonis 351 1 9