A hornworm that has been parasitized by a wasp, which laid eggs in the host. The eggs hatch into wormlike larvae that feed internally on the host tissues. When they finish feeding, they chew a hole in the integument of the host and crawl outside to construct a cocoon. Some worms (center and lower right) were caught by the camera in the process of crawling through the integument, while others that crawled out earlier have already started constructing cocoons in which to pupate. The cocoons will remain on the outside of the host until the adult wasps emerge.