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Flipper (anatomy)
A flipper is a typically flat forelimb evolved for movement through water. Various creatures have evolved flippers, for example penguins (also called "wings"), cetaceans (e.g. dolphins and whales; usually called "fins"), pinnipeds, and reptiles such as some varieties of turtle and the now-extinct plesiosaursmosasaursichthyosaurs, and metriorhynchids.

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