The viceroy (Limenitis archippus) is an unpalatable North American butterfly that has coloration similar to that of another species of unpalatable butterfly, the monarch (Danaus plexippus). This is an example of

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The resemblance between the viceroy and the monarch is not accidental but rather the result of natural selection. Both species are unpalatable to predators, and thus predators learn to avoid them. Müllerian mimicry is when two or more unpalatable species evolve similar warning coloration, presumably because predators learn faster to avoid a common predator than to avoid each individually. In this case, both the viceroy and the monarch are exhibiting Müllerian mimicry.

The Viceroy (Limenitis Archippus) Is an Unpalatable North American Butterfly