Dolphins are predators. Eat one fish, and sometimes crustaceans or mollusks . Dolphins have no ears, but hearing them is excellent. They hear with inner ear, working as a locator and determines where the object is located, what the distance to it and can even scan and identify all its characteristics. The body of their perfectly smooth, have a streamlined shape, like torpedoes, helps them to be excellent swimmers. Can reach the speed of 50 km per hour.