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Snapper for dinner? Here’s a bit of advice: you might want to check inside its mouth for a tongue-eating parasite. To find out why, check out this short Nova PBS video, which recreates all the horror of the mouth-infesting isopod Cymothoa exigua through the friendly medium of fabric puppets. Not only do these nasty parasitic crustaceans invade the fish’s mouth (through the gills) and devour its tongue, they may also shamelessly mate inside the mouth of their host (all the while feeding on its blood). And just so you know, mouth-infesting isopods like Cymothoa exigua often prey on fish that we regularly eat, including snapper.