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Scorpion. All scorpions glow in the dark, even after death, even fossilized. A thin, transparent film (hyaline) in the outermost layer (cuticle) of their exoskeleton contains a protein that fluoresces. Even after hundreds of millions of years, after all other cuticle layers are lost, the hyaline layer remains, fossilized in rocks...and it still glows. Nobody knows why scorpions fluoresce.