Red sea urchin (Strongylocentrotus franciscanus) amongst purple sea urchins (Strongylocentrotus purpuratus) in a tide pool at low tide. Sea urchins feed mainly on algae, but will also eat invertebrates such as mussels, sponges and brittle stars. Photographed at Tongue Point, in Washington, USA.

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TOP03231122

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達志影像

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RM

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