Monarch butterflies are toxic to birds because monarch caterpillars eat milkweed. viceroy butterflies closely resemble the monarchs but are not toxic sinse the viceroy caterpillars do not eat milkweed. This similarity in appearance developed because viceroy butterflies that closely resemble monarchs are- A) less likely to produce offsprings

B) less likely to be eaten by birds

C) more likely to make with monarchs

D) more likely to eat milkweed