GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY GEORGETTE DOUWMA / SCIENCE PHOTO LIBRARY
Necklace starfish (Fromia monilis) on a coral reef. Sea stars, or starfish, are a type of marine invertebrate known as echinoderms. They use tube-like feet on their underside to move across the seabed. They can be predators, plant-eaters or scavengers. Photographed in Papua New Guinea.
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