Abstract
Abstract A brief account is given of the discovery of the ultrasounds produced by rodents and the situations in which they are emitted. The equipment used to study these signals is described briefly. Rodents emit a wide variety of ultrasonic signals and while there is some evidence that they can hear these sounds, little is known of how they are produced. The physical characteristics of the signals themselves are therefore of great interest as they may give some clues as to the mechanism of ultrasound production. A description is give of the different harmonic spectra found in these ultrasonic signals and the variations in amplitude and patterns of frequency change that occur within these spectra. The relationship between the physical characteristics of the signals and the situations in which they are emitted is discussed, together with possible reasons for the use of such high frequency sounds. Finally the problems that have arisen out of this work are reviewed and future lines of study are indicated.
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