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Spectrogram of either a Gervais' or True's beaked whale click train (top), with a zoomed in, high resolution spectrogram (Wigner plot) of a single click highlighted in orange (bottom right). Note the frequency-modulated upsweep that is characteristic of beaked whale foraging clicks and the difference in click rate and upsweep from the Cuvier's beaked whale spectrogram.
© NOAA Fisheries / Annamaria Izzi DeAngelis /NEFSC