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small butter-colored stains are butterfly excrement. Butterflies, like all insects, digest their food inside a tube (called the alimentary canal) that runs from mouth to anus. To eat, a butterfly uncoils its long snout (proboscis) and sucks in nectar. The food enters the alimentary canal, gets digested, its nutrients absorbed, and waste excreted.

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Darwin Hudson

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2y ago
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Q: How do butterfly excrete?
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