Cetaceans have a streamlined, fusiform (torpedo-shape) body. This reduces drag on the animal as it moves forward through the viscose water. The cetaceans' flat fluke (horizontal plane) separates them from fish which have a vertical plane tail. With the up and down motion of the spine and the strong muscles attached to the fluke, the cetacean propels itself forward. At maximum speed, cetaceans have been clocked at 29-40 kmph but cruising speed is between 4-11 kmph.


Notice the sleek body design of these dolphins.