John E. Woodmansee Photo: Tobacco hornworm on a tomato plant that has been attacked by a parasitic Braconid wasp. The white capsules on its back are the pupal stage of the tiny wasp. Braconid larvae ...

Caterpillars shed their skin several times as they grow, and in the final stage of metamorphosis, they form their pupa (chrysalis). As the warm summer and spring suns arrives, it signals a change in ...