In many species, only the immature stage of a parasite feeds on the host, as illustrated with this aphid parasite. A. An adult parasite lays an egg inside a live aphid. B. The egg hatches into a parasite larva that grows as it feeds on the aphid's insides. C. The parasite kills the aphid and pupates inside the mummified host. D. The wasp adult chews a hole, emerges, and seeks other aphids to parasitize. Credit: Adapted from an illustration by David Kidd.
