The whale provides communication by using echolocation. This works by the sound waves produced by the killer whale bounce off of objects that are in the water. They return to the whale in the form of an echo. This helps them to determine the size, shape, speed, distance, direction and the internal structure of the object in the water. The sound waves travel about 1 mile per second.
The most common sound is a short clicking noise. This noise lasts 1-5 milliseconds. These and many other sounds that the killer whale makes are used for navigation and communication.
You can find lots of other facts at this site: www.seaworld.org. (just click on this hyperlink to find out for yourself.)
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