Rays have flattened, disklike bodies, with their mouths and five gill openings usually on the underside. Their pectoral fins are greatly enlarged and winglike, extending along the sides of the head. Many rays move by using these fins. As part of their respiratory activity, they take in water through spiracles, which are large openings on the upper surface of the head. Sharks, on the other hand, pull in water through the mouth. Sharks have a fusiform or spindle shape. They have fins that are less winglike and more triangular, and most have large tails that they use to dart through the water.
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