Bagworms are a form of caterpillar that form 1.5- to 2-inch-long bags that hang from their host, these bags tend to be mistaken for pinecones. They typically prefer species such as arborvitaes, junipers, spruces, pines, and cedars. When it emerges as a moth, only the male species will have wings. The female's main purpose is to mate and reproduce.
