Parasitism

Parasitism is an interaction in which one organism benefits by living on or in another, which is harmed but usually not immediately killed.

Host–parasite coevolution: Reciprocal evolutionary change between parasites and their hosts. Host defenses and parasite countermeasures continually shape this interaction.
Symbiosis: A close, persistent interaction between organisms of different species. Parasitism is one outcome within the broader range of close species associations.
Parasitic disease: A disease caused by a parasite living in or on a host. Human and animal infections make the costs of parasitism directly visible.
Cymothoa exigua: A parasitic isopod that attaches to a fish's tongue and can replace it. This parasite illustrates an unusually direct transformation of host anatomy.
Immune evasion: Strategies pathogens and parasites use to avoid or weaken host immune responses. Parasites persist by escaping, suppressing, or redirecting host defenses.
Host (biology): An organism that provides resources or habitat to another organism. The host supplies the habitat or resources on which a parasite depends.
Malaria: A mosquito-borne disease caused by Plasmodium parasites. Its parasite alternates between human and mosquito hosts.
Ophiocordyceps unilateralis: A fungus that infects ants and manipulates their behavior before killing them. Its life cycle shows how parasite effects can extend into host behavior.
Parasite life cycle: The sequence of developmental stages through which a parasite passes during its life. Many parasites depend on distinct hosts or environments at successive stages.
Ectoparasite: A parasite that lives on the external surface of its host. Ticks and lice exemplify parasites that exploit hosts from the outside.

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