The difference between the two is that vocalization is made up of the many noises that dolphins use to communicate. These sounds come from a dolphin s blowhole. Echolocation, on the other hand, is the way in which dolphins locate and distinguish objects underwater. A dolphin emits a sound into the water, and then listens for the echo. This allows the dolphin to find his way through dark or murky water without bumping into anything.
Dolphins produce a very powerful clicking sound.
The sound wave travels through the water and then bounces off objects. The sound then returns to the dolphin. The clicks come from the dolphin s rounded forehead, also known as the melon. The melon and lower jawbone are filled with a jelly-like substance that simplifies the sound waves. As a result, as the dolphin swims, it moves its head back and forth.