LOUISE MURRAY / SCIENCE PHOTO LIBRARY LOUISE MURRAY / SCIENCE PHOTO LIBRARY
Coral and hermit crab, fluorescing under blue light. The coral fluoresces bright orange and green under blue light and the hermit crab, hiding within a disused worm hole, fluoresces faintly. Some species of coral emit a fluorescent glow. It is thought the glow may attract symbiotic algae, or protect the coral from the intense ultraviolet light of the sun in shallow water. Animals may also fluoresce as a means of camouflage, warning or sexual signal. Photographed in Thailand.
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