When a nontoxic viceroy butterfly has come to resemble the distasteful monarch butterfly,the relationship can best be called:

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Batesian mimicry is a type of mimicry where a harmless species (in this case, the viceroy butterfly) mimics the warning signals of a harmful or toxic species (the monarch butterfly) to deceive predators into thinking that it too is toxic or harmful. In this scenario, the viceroy butterfly benefits from its resemblance to the monarch butterfly by being less likely to be eaten, while the monarch butterfly is not impacted. This is different from Müllerian mimicry, where both species are toxic or harmful and resemble each other, or mutualism and symbiosis, where both species benefit from their relationship.

When a Nontoxic Viceroy Butterfly Has Come to Resemble the Distasteful