
A tiny crustacean called Cymothoa exigua enters a fish through the gills, severs the tongue, and then attaches itself in the tongue’s place, functioning as a working replacement organ for the rest of the fish’s life
Cymothoa exigua, a small marine crustacean, enters fish through the gills, severs the tongue, and attaches to the stump — where it functions as a working replacement organ for the rest of the fish's life. It is the only parasite known to do this.














