Just a little predator mimicry to brighten your day. Papilio troilus Spicebush Swallowtail This is a wandering phase caterpillar, now off its host plant and looking for a suitable site to pupate. They turn yellow or orange around the time they leave their host for good. The false eye-spots and swollen thoracic region act to create the impression of a "snake head" that may make birds and other predators wary to approach and investigate. They also act to makes this one of the most easily anthropom