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Flipper
forelimb evolved for movement through water / From Wikipedia, the free encyclopedia
A flipper is a special kind of limb that is flattened like a paddle for moving through water. Many animals that live in water, such as whales and seals have flippers. The flipper of a fish is called a fin.
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b8/SwimFins_02.jpg/640px-SwimFins_02.jpg)
It can also be an item worn on the foot to help people swim more easily.