The spinochordodes tellini (a hair worm) causes a grasshopper to seek water - where it eventually drowns - to enable itself to end up in it's optimal breeding environment.
The Helminthes enters crabs and causes them to leave the shelter of it's native tide pools (by lowering the crab's inhibitions) for the feeding areas of sea birds (which are the parasites primary hosts).
With our suspect food supply - maybe we are victims of some sort of parasitic control over ourselves.
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