This Parasite Eats a Fish's Tongue — And Takes Its Place 
By Matt Simon US Source: wired 11/22/2013
Matt Simon
Stop me if you’ve heard this one before. A fish walks into a bar and takes a seat. The bartender asks what he wants to drink, but the fish doesn’t say anything. So the bartender asks, “What, cat got your tongue?” The fish grabs a cocktail napkin and writes out, No, actually, it was an isopod. An isopod got my tongue and by "got" I mean she ate it.
 

That joke may not be funny to you, but it’s hilarious to the tongue-eating isopod. You see, in the Gulf of California there actually exists a critter, Cymothoa exigua, that targets a fish by infiltrating its gills and latching onto its tongue. It proceeds to not only consume the organ, but will then replace it with its own body, providing the fish with a new fully functioning tongue it uses (probably a bit begrudgingly) to grind food against tiny teeth on the roof of its mouth.

 
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