Definitions for "Echolocation"
Keywords:  dolphins, cetaceans, bats, sonar, prey
(3) a process used by bats for locating distant or invisible objects (prey) by detecting sound waves reflected back from the objects.
The way whales use sound to "see" or find things under water.
the detection of an object by means of reflected sound.  The animal emits a sound, usually at a very high frequency, which bounces off an object and returns as an echo.  Interpreting the echo and the time taken for it to return allows the animal to determine the position, distance, and size of the object, and so helps it to orientate, navigate, and find food.
determining the location of something by measuring the time it takes for an echo to return from it