I love dolphins. It is so great that they are aquatic mammals that live in so many places.
Plus they're really friendly! How do they communicate with each other?
Dolphins communicate with clicks. They belong to the Cetacea family.
That's amazing! What is echolocation?
Animal echolocation
Echolocation, also called bio sonar, is the biological sonar used by several species of animal.
Echolocating animals emit calls out to the environment 
and listen to the echoes of those calls that return from various objects near them. They use these echoes to locate and identify the objects. Echolocation is used for navigation and for foraging (or hunting) in various environments.
Echolocating animals include some mammals and a few birds; most notably microchiropteran bats and odontocetes (toothed whales and dolphins), but also
Marine mammals use vocalisations in many different ways. Dolphins communicate via clicks and whistles, and whales use low frequency moans or pulse signals. Each signal varies in terms of frequency and different signals are used to communicate different aspects. In dolphins, echolocation is used in order to detect and characterize objects and whistles are used in sociable herds as identification and communication devices.
See also.
- Audiology
- Audiometry
- The Mosquito
- Seismic communication
- Minimum audibility curve
- Musical acoustics