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Dolphins aquatic mammals of the order Cetacea belonging either to the family of dolphins. Sea or to the superfamily of river dolphins freshwater. Species of the family Delphinidae are found in all seas and sometimes come into the mouth of large rivers. Representatives of the family of fresh water or river have a much more restricted distribution. Most of them inhabit the interior freshwater reservoirs although some of them can penetrate into brackish estuaries and coastal seas even in the zone.

Dolphin body perfectly adapted for movement in the water and allow them to swim very fast. It also helps very elastic and smooth skin thanks to the oily secretions to facilitate sliding in the water. Dorsal fin if present is usually rather crescent than the triangular if it is not bent it is very high as in the male killer whales.

Most of the dolphins the jaws form a well-developed mouth beak. In the mouth is two to 272 teeth record for mammals. The teeth are shaped like pointed spikes ideal for holding slippery extraction.

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