I've wondered if dolphins speak to each other (assuming that they do) in a serial flow of abstract symbols-- words, like we do, or if they use their sonar to pr

I've wondered if dolphins speak to each other (assuming that they do) in a serial flow of abstract symbols-- words, like we do, or if they use their sonar to project 3-D 'holograms' of objects and shapes to each other. Maybe even both. What a wonderful day when we crack the code.