Final answer:
The viceroy butterfly benefits from looking like the monarch butterfly by using Batesian mimicry to deter predators.
Step-by-step explanation:
The viceroy butterfly benefits from looking like the monarch butterfly because it deters predators in the same way as the monarch butterflies. Both the monarch and viceroy butterflies have warning coloration, which signals to potential predators that they are distasteful or poisonous. By mimicking the appearance of the monarch butterfly, the viceroy butterfly is able to benefit from the predator avoidance behavior that the monarch butterfly has already established. This is an example of Batesian mimicry, where a harmless species mimics a harmful one to deter predators.