In consumption, one living thing eats another. Three kinds of consumption are predation, herbivory, and parasitism. In predation, one animal, the predator, kills and eats another animal, the prey. In herbivory, an animal called an herbivore eats a plant, either in part or in whole. In parasitism, a parasite lives on another living thing, the host. The parasite eats small parts of tissue or nutrients from the host, but usually does not kill it.