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The tongue-eating louse does exactly what its name suggests

"This parasite detaches the fish's tongue, attaches itself to the fish's mouth, and becomes its tongue," the Galveston Island State Park says, describing the parasitic tongue-eating louse.

It's the stuff of nightmares, or science fiction: a parasite that wants to get inside an animal's mouth, where it attacks — and replaces — the tongue. That's

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