The caterpillar is generally black, covered with short black hair, and marked with a row of orange or yellow spots along the bottom of each side. Caterpillars from high altitude may be grayish brown to grayish pink, shaded with yellow and marked with black. The black, spotted form is believed to mimic a poisonous centipede while the high altitude form is colored to camouflage with its environment. Both strategies provide protection from predators.