Yellow-tail moth (Eupractis similis) larva on a cherry tree. This larva is protected by hairs on its back which can cause skin irritation in humans. Some of the spicules are eventually incorporated into the pupal case (chrysalis), and thus continue to act as a deterrent to predators. If the pupa hatches to a female moth, she will collect spicules from the discarded larval skin by means of a brush-like tuft of hairs on her head. The protection therefore extends throughout the life cycle of the insect.