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Dolphins are small members of the whale family. Dolphins and porpoises are mammals. They are not a fish. They are warm blooded.   Dolphins and porpoises have been clocked at sea traveling at speeds of more than 25 miles per hour. The largest dolphins reach a length of about 15 feet, but most species are 7 to 10 feet long.  
Dolphins are famous for their intelligence and learning abilities. Dolphins communicate using an  underwater sonar that consists of high pitched whistles and squeaks.   Dolphins have a highly developed sense of hearing. Dolphins often travel in groups like a herd.


Dolphins - Endangered species