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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. S. tellinii does not influence its host to actively seek water over large distances, but only when it is already close to water. 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.