echolocation

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ech·o·lo·ca·tion

(ek'ō-lō-kā'shŭn),
Term applied to the method by which bats direct their flight and avoid solid objects. The creatures emit high-pitched cries that, though inaudible to human ears, are heard by the bats themselves as reflected sounds (echoes) from objects in their path.
Farlex Partner Medical Dictionary © Farlex 2012

echolocation

the means by which objects are identified through echoes returned from very high frequency sound emissions. Bats use such a system to avoid objects in flight and to locate prey, as do toothed whales and dolphins.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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