The wonders of evolution: Tongue-eating louse (Cymothoa exigua). This parasite enters the fish's mouth (Lutjanus sp.), clings to the tongue's base and extracts all the blood until the tongue atrophies.. Then it replaces the fish's tongue by attaching its own body to the muscles of the tongue stub, and starts to feed on what the host eats; the fish can live normally, and there are even studies around the benefits that he could receive from this parasite. There are no risks to humans.
This clear purple sea creature is proof the ocean is where aliens hide