GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Clearfin lionfish (Pterois radiata) swimming over a coral reef. Also known as the radial lionfish or tailbar lion fish, this is a nocturnal, ray-finned fish with highly venomous spines that can be fatal to humans. Photographed in the Red Sea off the coast of Egypt.
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