DAVID IRELAND / SCIENCE PHOTO LIBRARY DAVID IRELAND / SCIENCE PHOTO LIBRARY
Swimming around a rock wall at night to find a yellow crinoid. Crinoids are echinoderms, relatives of starfish. They filter plankton from the currents with their feathery arms. They have remained essentially unchanged for some 460 million years, with fossils from the Ordovician closely resembling modern forms. Filmed on the Great Barrier Reef, Australia.
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