LOUISE MURRAY / SCIENCE PHOTO LIBRARY LOUISE MURRAY / SCIENCE PHOTO LIBRARY
Goby fish and coral fluorescing green and red under blue light. 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 fluoresce as a means of camouflage, warning or sexual signal. Photographed in Thailand.
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