Rough-toothed dolphins are usually seen swimming in schools of 10-20 individuals, although groups of 50 or more have been reported. They are sometimes seen cruising along at high speed, with their beaks at the surface and their dorsal fins above the water, for fairly long periods of time. Learn more about the Steno bredanensis, more commonly known as a Rough-toothed Dolphin, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.