Fig 3. Spectrogram (upper panel) and waveform (middle panel) showing 3.5 s of data from DLBB14-05 emitting a feeding click train ending in a terminal buzz, and its corresponding inter-click interval (ICI) measured with script Callmark (lower panel).

Purple asterisks mark each click peak time, with time zero equates to 14 hrs and 47 min since the beginning of the recording, or 5:08 am AKDT on 29 August 2014. Note clicks from another beluga were excluded at 700 to 900 ms and again at 2900 to 3500 ms.