Other Invertebrates: World's Weirdest: Amazing Sting Defense
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World's Weirdest: Freaks in the Ocean
World's Weirdest: Amazing Sting Defense
The Portuguese man-of-war is 50 times bigger than this nudibranch, a tiny sea slug. But in this David-versus-Goliath scenario, don't bet against the nudibranch. It can nibble away at its enemy's deadly tentacles and use the man-of-war's stingers for its own.