Look at who’s come to say hello! It’s our dear friend, Cymothoa exigua.
When one of these crustaceans encounters a rose snapper, it enters the fish’s mouth and steadily devours the fish’s tongue. Once it has done this, the crustacean uses hooks on its underside to attach itself to the floor of the fish’s mouth and thereafter serves as a replacement tongue!
CRIKEY !!! Learn more here.