Parasite Got Your Tongue?
The female Cymothoa exigua will latch onto a fish's tongue, then extract blood until the tongue atrophies and falls off. By securing itself to the stub where the tongue used to be, the parasite become a stand-in tongue for the fish. The much-smaller males live in the fish's gill chamber, and may become female if there isn't already one in the fish's mouth.
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from NOVA PBS
Key Facts In This Video
Adult Cymothoa exigua males can become females. (0:36)
A female Cymothoa exigua attaches herself to the base of a fish's tongue, then extracts blood from it until the tongue withers and dies. (1:02)
Male Cymothoa exigua living in a fish's gill chamber might mate with the female living in the mouth. (1:34)