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Any organism that is parasitic during part of its life cycle, especially one that eventually kills its host.

A parasitoid wasp (Trioxys complanatus, Aphidiinae) ovipositing into the body of a spotted alfalfa aphid (Therioaphis maculata, Calaphidinae), a behaviour that is used in biological pest control

Any organism that is parasitic during part of its life cycle, especially one that eventually kills its host.

A hyperparasitoid chalcidoid wasp on the cocoons of its host, a braconid wasp, itself a koinobiont parasitoid of Lepidoptera

Any organism that is parasitic during part of its life cycle, especially one that eventually kills its host.

Female phorid fly Apocephalus borealis (centre left) ovipositing into the abdomen of a worker honey bee, altering its behaviour