Executioners Current: Thomas Edison, George Westinghouse, and the Invention of the Electric Chair. New York: Knopf Doubleday Publishing Group. ISBN 978-0-37572-446-6.
The tympanal organs of some insects are extremely sensitive, offering acute hearing beyond that of most other animals. The female cricket fly Ormia ochracea has tympanal organs on each side of her abdomen. They are connected by a thin bridge of exoskeleton and they function like a tiny pair of eardrums, but, because they are linked, they provide acute directional information. The fly uses her "ears" to detect the call of her host, a male cricket. Depending on where the song of the cricket is coming from, the flys hearing organs will reverberate at slightly different frequencies. This difference may be as little as 50 billionths of a second, but it is enough to allow the fly to home in directly on a singing male cricket and parasitise it.Simpler structures allow other arthropods to detect near-field sounds. Spiders and cockroaches, for example, have hairs on their legs which are used for detecting sound. Caterpillars may also have hairs on their body that perceive vibrations and allow them to respond to sound. See also
Hear, hear
Hearing test
Righting reflex

References
External links
 The dictionary definition of ear at Wiktionary
 Media related to Ears at Wikimedia Commons