What do viceroy butterflies use to look like poisonous Monarch butterflies?

Monarch caterpillars consume milkweed plants and Viceroy caterpillars eat willows. You can tell the difference between the two now by their flight patterns. I would say the answer to your question is that though they are similar, Viceroy were the “uglier” for the simple reason of survival. Predators would find their coloration as un-tasty.

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They use something called Mullerian mimic so they will be protected from predators  

Explanation:

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