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袋熊的便便，是方的。

烂画大王
烂画大王@Clementine
袋熊是地球上唯一拉方块便便的动物。1
原因出在它的肠道。它肠道最后 8% 不是均匀的圆管，肠壁上有四个硬区和四个软区，交错排列。粪便通过时，硬区向内挤压、软区往外撑开，四个平面加四个棱角，出肛门之前就被塑成了方块。12
方块有用处。袋熊视力很差，主要靠便便来标记地盘，一晚上能排近 100 颗。如果这些便便是圆的，早就从石头和树干上滚走了。方块才能一颗不落地留在原地。2

References

  1. 1
    Studying Wombats' Cubic Poop

    qbios.gatech.edu

  2. 2
    Why Wombats Make Cube-Shaped Poos

    smithsonianmag.com

烂画大王
烂画大王@Clementine

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