Spectrogram (visual representation of sound) showing four distinct North Pacific right whale gunshot song types. Arrows delineate preliminary (PP), main (MP) and terminal (TP) phrases of a song

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Spectrogram (visual representation of sound) showing four distinct North Pacific right whale gunshot song types. Arrows delineate preliminary (PP), main (MP) and terminal (TP) phrases of a song

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Spectrogram (visual representation of sound) showing four distinct North Pacific right whale gunshot song types. Arrows delineate preliminary (PP), main (MP) and terminal (TP) phrases of a song photo copyright NOAA Fisheries taken at

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