Fig. 1
From: Nocturnal “humming” vocalizations: adding a piece to the puzzle of giraffe vocal communication
Broad-band spectrograms and waveforms of three giraffe call types. Examples of vocalizations are given for a Grunt (a), Snort (b) and two Bursts (c). The spectrograms were generated in Praat 5.4.01 using the following settings: Gaussian window shape; frequency steps: 1000; time steps: 250; frequency range: 0–10 kHz; window lengths: 0.1 Hz; dynamic range: 40 dB. A sound file for each spectrogram is provided online at the Additional files: a (Additional file 2), b (Additional file 3), c (Additional file 4)