Acoustical Aspects of Hearing and Echolocation in Bats
The structure of the external ear of Microchiropteran bats shows a remarkable diversity, particularly in the shape and size of the pinna. There is also a sharp contrast between the highly mobile pinnae of Rhinolophids and Hipposiderids compared to the almost immobile pinnae of Megadermatids. The presence of “large” ears (pinnae) is often associated with a gleaning type of foraging behaviour, including the ability to detect and capture prey by passive listening (Neuweiler, 1984). Within this context, the Australian false vampire or ghost bat Macroderma gigas, has extremely large pinnae, possibly the largest amongst the Microchiroptera and the acoustical properties of the external ear have been examined. Similar data has been obtained in Gould’s long-eared bat Nyctophilus gouldi, which is also probably a gleaning bat similar Antrozous pallidus (Bell, 1982).
KeywordsTympanic Membrane Passive Listening Acoustic Axis Sonar Frequency Pressure Gain
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