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The Glaucus Atlanticus Sea Slug may look like something out of a Final Fantasy game, but this tiny creature is all too real and can pack a nasty sting! It is one of the few creatures able to feed on P. physalis or the Portuguese Man o'War due to an inherent immunity to it's toxic nematocysts. After ingestion, G. Atlanticus collects the venom in specialized sacs or cnidosacs that lie on the tips of thin feather-like fingers on its body. Because this venom is stored, it can eventually be even more powerful than the original toxin from the Man o' War itself.

http://www.reddit.com/r/pics/comments/rwb0y/glaucus_atlanticus_sea_slug/
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