Are butterflies poisonous?

Some butterflies such as the Monarch and Pipevine Swallowtail eat poisonous plants as caterpillars and are poisonous themselves as adult butterflies. Birds learn not to eat them. Other good-tasting butterflies (called "mimics") come to resemble them and thus benefit from this "umbrella" of protection.

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Monarch (Danaus plexippus)
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Pipevine Swallowtail (Battus philenor)
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Viceroy (Limenitis archippus),
a Monarch mimic
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Red-spotted Purple
(Limenitis arthemis astyanax),
a Pipevine Swallowtail mimic

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