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. 2015 Aug 5;2(8):150291. doi: 10.1098/rsos.150291

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© 2015 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 2. — Waveform (a) and spectrogram (b) of one of the 30 pre-recorded bat echolocation call sequences (edited with SASLAB PRO (Avisoft Bioacoustics, Berlin, Germany; FFT size 1024)). Playback sequences were edited from calls where the search-phase component of the sequence recording (not shown) was identified as Nyctalus spp. based on existing echolocation parameters including: frequency of maximum energy (kHz), start frequency (kHz), end frequency (kHz), call duration (ms) and interpulse interval (ms) [18,19]. British Nyctalus spp. typically broadcast their loudest calls between 19 and 27 kHz [19], as is the case with our recordings.