How do dolphins interact with another dolphin?

They interact well with each other. They use a series of clicking noises as communication. When they stray to far from their pod, they use echo-location to find anything that resembles a dolphin, as well as that clicking noise. Interesting fact when I was around 7, I was really interested in dolphins and read in a book that dolphins have that weird shaped head for a reason and that is the special place for using eco-location and identifing things around them.