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catgirl rule
(lemmy.world)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
That's cause in nature, grass is easier to clean than stone. If you chuck up on the stony parts of your house, it's not magically going to go away. But if you chuck up on the grass, it'll soak into the soil and the bugs will break it down and the grass will metabolise it. They're just displaying normal, practical behaviour for a world without humans.