PETER MATULAVICH / SCIENCE PHOTO LIBRARY PETER MATULAVICH / SCIENCE PHOTO LIBRARY
Scientist places emperor scorpions (Pandinus imperator) under ultraviolet light in this laboratory demonstration showing arthropod fluorescence. Scorpions glow due to fluorescent chemicals in the cuticle making up their exoskeleton. While a number of arthropods fluoresce, including some insects and spiders, this phenomena is especially strong among scorpions and whip scorpions (vinegaroons). No one is sure if fluorescence has a useful purpose and is likely just a random act of evolution. The emperor scorpion is native to much of Africa and can reach 20 cm in length.
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