Map of study region and summary of DTAG deployments. Map of study regionand summary of DTAG deployments. Orange, blue and green markers indicate where recording tags were deployed on blue whales (Balaenoptera musculus) in the austral summers of 2014, 2015 and 2016. White markers show locations of night anchorages. In the summary table, the ‘Other’ column represents highly variable, short duration sounds. The ‘M–C pair’ superscripts in the ‘Group size’ column indicate mother–calf pairs. Figure from Bocconcelli et al. (2016). Mark R. Saddler et al. J Exp Biol 2017;220:4119-4129 © 2017. Published by The Company of Biologists Ltd