Bottlenose dolphins communicate by using a number of squawks, chirps, and clicks. Some even have "talked" on the phone. That's right! During one study, researchers in Hawaii listened as a mother dolphin and her baby—swimming in separate tanks—chatted to each other through a special audio device. Scientists were unable to decode the meaning of their chatter. They observed, however, that each of the dolphins seemed to know who was on the other end of the line. Perhaps this has something to do with bottle nose dolphins' "signature whistles."

Bottle nose dolphins make a variety of noises, but many sound like whistles. In fact, scientists believe that every bottlenose dolphin develops a unique whistle. The dolphin's whistle is the equivalent of