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. 2021 Jul 7;288(1954):20211156. doi: 10.1098/rspb.2021.1156

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© 2021 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — (a) Location of the Azores (inset map) and of the hydrophone moorings (black dots) at two locations (Gigante and Condor). Example spectrograms showing (b) the 20-Hz and (c) the 40-Hz call. (Online version in colour.)