An isopod may sound like something you could listen to music on, but in reality they are nasty parasites that attack their hosts in an unusual and disgusting way.

At a length of about 2 centimeters long, the isopod will attach itself to the tongue of a living fish and begin sucking blood from it. As the isopod grows, more and more blood is extracted until the tongue actually atrophies and dies, falling off.

Now that room has been made in the mouth, the isopod moves in and actually replaces the fish's tongue with its body. The fish continues life normally as the disgusting parasite continues to gorge itself inside of the unfortunate fish's mouth.

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