Although their total numbers are not as great as the monarchs in Mexico, there are more than ten individual species of milkweed butterflies represented here, as opposed to the single species of Monarch butterfly in Mexico.
數量雖遠不及墨西哥，但卻具有十多種斑蝶混雜群聚的特色，不同於墨西哥的單一蝶種。