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Fig. 1. Characteristic samples of a Megaderma lyra echolocation call (left) and a Phyllostomus discolor call (right). The upper panels show the spectrograms (the shaded bar shows the magnitude in dB); the lower panels show the oscillograms. M. lyra emits brief (0.5-1.5 ms), broadband, multi-harmonic echolocation calls. The fundamental frequency is frequency modulated from about 26 to 19 kHz. The strongest harmonics are the 3rd, 4th or 5th. P. discolor also emits brief (<3 ms), broadband, multi-harmonic echolocation calls covering the frequency range between 40 and 90 kHz. The fundamental frequency is modulated from about 23.5 to 16 kHz.





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