Caterpillar of the viceroy butterfly on a willow tree on World Peace Wetland Prairie

Please click on image to ENLARGE TO photo of viceroy butterfly caterpillar on willow leaf at World Peace Wetland Prairie in Fayetteville, Arkansas. Viceroys (Limenitis archippus) look much like monarchs but their caterpillars look far different and depend on willows and other native trees, while monarch caterpillars depend on the many species of milkweed.