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The nematomorph hairworm Spinochordodes tellinii is a parasitic worm whose larvae develop in orthopteran insects (grasshoppers and crickets). This parasite is able to influence its host's behavior: once the parasite is grown, it causes its grasshopper host to jump into water, where the grasshopper will likely drown. The parasite then leaves its host; the adult worm lives and reproduces in water.[2] S. tellinii does not influence its host to actively seek water over large distances, but only when it is already close to water.[3] The microscopic larvae are ingested by their insect hosts and develop inside them into worms that can be three to four times longer than the host.
originally posted by: CagliostroTheGreat
theantediluvian,
Glad they can't be picked up by pets or humans!