How do dolphins communicate?

Dolphins can hear and communicate in a far larger range than humans can. Dolphin hearing ranges from about 75 hertz to over 150 kilohertz but most humans can only hear a much smaller spectrum of sound, from about 20 Hertz to 20 kilohertz. A dolphin can use both clicks and whistles to communicate in the same breath. Clicks are thought to be used primarily for echolocation and whistles for communication. A dolphin can click a thousand times a second and some people think they can use their clicks to stun potential prey.