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The bright orange viceroy butterfly (Limenitis archippus) resembles the larger Monarch butterfly. The caterpillars of the viceroy feed on plants in the willow family and accumulate salicylic acid (similar to aspirin). This makes them bitter and unpalatable to predators. Their similarity with the equally orange and black Monarch butterfly, which is also poisonous is an example of Müllerian mimicry which (from Wikipedia) “is a natural phenomenon in which two or more poisonous species, that may or may not be closely related and share one or more common predators, have come to mimic each other's warning signals”.
Fortunately, I am not planning to eat butterflies so I can just enjoy their beauty.