original when threatens dolphins, t

original when threatens dolphins, they literally take to the air, in rapid leaps ten danger feet The action is so different from the dolphins' normal mode of travel long. swimming just beneath the surface-that scientists have long wondered why they do it Two maritime biologists have discovered the answer: at high speeds. leaping saves the dolphins' energy David Au and Daniel Weihs of Southwest Fisheries Center in La Jolla. California. Calculated the energy that dolphins need to leap and swim. They measured water friction, the density of dolphins, and the amount of spray they kick up. As dolphins swim close to the surface order to breathe, they waste energy by in making waves. The faster they swim. the they waste. Above ten knots, dolphins more find it more economical propel themselves through the air in leaps and bounds.