Cymothoa exigua, or the tongue-eating louse, is a parasitic isopod that severs the blood vessels in a fish's tongue, causing the tongue to fall off. It then attaches itself to the remaining stub of tongue and the parasite itself effectively serves as the fish's new "tongue"
Lol the parasite is waving at the camera.
I never thought a parasite could look this cute
It looks weirdly cuter than the fish itself