9 s of calling song slowed to one-eighth speed (frequencies are reduced to 1/8 of their original values and durations are 8 times greater). Click on sound bar to hear entire recording.

Waveform of 0.6 s of calling (from recording by G. K. Morris). The song alternates between a sonic mode (extreme left and center right) and an ultrasonic mode (extreme right and center left). Peak frequency of sonic mode is ca. 16 kHz; of ultrasonic mode, ca. 32 kHz. Click on sound bar to hear graphed song. The sound you will hear lasts 4.8 s, because it is the graphed sound slowed to one-eighth speed, which lowers the peak frequencies to 2 kHz and 4 kHz. Click on waveform to expand first transition from ultrasonic to sonic mode.