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Sea fan

Sea fan, colony of coral animals called polyps (genus Gorgonia) common to shallow, warm waters of the Atlantic and Pacific oceans. The tiny, cylindrical polyps grow together in a flat, treelike form 2–24 in (5–60 cm) across. Coloration commonly ranges from yellows to reds to purples.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Sato, Eisaku to Serra, Junípero