An earlier post reminded me of this little guy, cymothoa exigua. He sucks the blood out the tongue until it atrophies, then attaches itself to the muscles in the leftover stub, and replaces the tongue while continuing to eat blood and mucus in the fish's mouth.
(and, just to add, I think there's nothing wrong with Madonna's body per se, she's more fit than I, and there's nothing wrong with wrinkles, I just think she's a talentless skank who is trying too hard and has nothing to sell but her body)