In this video from NOVA, you'll learn about how the isopods known colloquially as tongue-eating parasites aren't just about, well, eating tongues. They also have a cool reproductive cycle, complete with hermaphroditism. Plus, you'll get some helpful advice about checking the mouths of your favorite fish for these strange invaders.
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Except for the pink ribbons, what exactly is friendly about this version of those suckers? That they f*uck in their hosts mouth?