Some scorpions, such as the one seen here, are fluorescent. Certain spiders, insects and minerals glow too. Sparks explained that the luminescent minerals contain fluorescent molecules that glow under ultraviolet light.
Andrew Parker, research leader of the Department of Zoology at London’s Natural History Museum, explained that as soon as certain organisms evolved the ability to see, color, light, fluorescence and more all gained greater importance.
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“Since vision evolved, everything has been fully adapted to the presence of a retina, adapted in terms of their color, shape and behavior,” Parker, author of the related book In the Blink of an Eye, told Discovery News. “Prior to the first highly mobile predator with vision, i.e. one that could have an affect on all other cohabitants, the rules would have been much different, and indeed we know from fossils that animal forms and ecology were much different.”