The tympanal organ consists of a thin membrane stretched above an open space. Sound vibrates the membrane and these vibrations are detected by another structure at the base of the open space. The position of the tympanal organ differs between species and can be found on the thorax, abdomen or legs.
Some moths possess tympanal organs that allow them to detect the ultrasonic hunting calls of bats. On hearing the call the moth folds its wings and drops through the air in an attempt to avoid being eaten by the bat.
Other names for (or types of) Tympanal organ include:
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