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