Spectrogram showing North Pacific right whale upcalls (top panel, indicated with arrow), and gunshot calls (bottom panel) from acoustic recordings in Unimak Pass

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Spectrogram showing North Pacific right whale upcalls (top panel, indicated with arrow), and gunshot calls (bottom panel) from acoustic recordings in Unimak Pass

© NOAA Fisheries

Spectrogram showing North Pacific right whale upcalls (top panel, indicated with arrow), and gunshot calls (bottom panel) from acoustic recordings in Unimak Pass photo copyright NOAA Fisheries taken at and featuring the Cruising Yacht class

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