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Any of various nymphalid butterflies of the subfamily Danainae, especially the monarch butterfly, that are poisonous because their larvae feed on milkweeds or related plants containing toxins.
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|Noun||1.||milkweed butterfly - large migratory American butterfly having deep orange wings with black and white markings; the larvae feed on milkweed|
danaid, danaid butterfly - large tropical butterfly with degenerate forelegs and an unpleasant taste