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#The [[sound]] is detected.
: The time it takes the [[sound]] to return to its source can show how far away the [[object]] is located. Since the [[sound]] has to travel to the [[object]] and back again this time is twice as long as the time taken just to travel to the [[object]].
: An [[object]] can be made 'invisible' to [[echolocation]] if it [[Absorb (Physics)absorbs]] the [[sound]] instead of [[reflect]]ing it.
[[Echolocation]] is used by: