Absurd Creature of the Week: This Parasite Eats a Fish’s Tongue — And Takes Its Place

By Matt Simon In the Gulf of California there exists a critter, Cymothoa exigua, which targets a fish by infiltrating its gills and latching onto its tongue. It proceeds to not only consume the organ, but will then replace it with its own body, leaving the fish with the new fully functioning tongue of its worst nightmares.

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Source: Wired