Mud-puddling - Wikipedia - Do butterflies pee on people
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Adult butterflies do not urinate or defecate (or "go to the bathroom"). The larval life stage - the caterpillar - does all of the eating, and caterpillars almost. Answer: Butterflies pee. They only drink liquids and never eat solids, so they don't actually 'poop' but only pass liquid. Many insects pee we just don't think.