Fig 1. Properties of echolocation pulses and communication calls produced by bats.

(a) Exemplary acoustic recording including an isolated call and a vocalization train. Zoomed-in views have been included in (b) and (c) to show spectrograms of the syllable train and the isolated echolocation pulse. Panels (d) and (e) display two further examples of isolated vocalizations (communication calls in this case). Panel (f) shows a combined histogram of sound duration and peak frequency in echolocation and communication sounds. Note that these two call types are well segregated in the frequency domain. The latter is also noticeable in the average call spectra shown in (g). Data underlying this figure can be found at https://doi.org/10.12751/g-node.6a0d94.