Photographs of the potential humpback whale mother–calf pairs.

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Photographs of the potential humpback whale mother–calf pairs. Photographs of the potential humpback whale mother–calf pairs. Groups of one or two tagged whales exposed to sonar included three potential mother–calf pairs: (A) mn11_160a and an untagged adult (with the source ship in the background), (B) mn11_165e and calf mn11_165f, and (C) mn12_180b and an untagged calf. Note that the calf of mn12_180b was substantially smaller than the other two calves. Paul J. Wensveen et al. J Exp Biol 2017;220:4150-4161 © 2017. Published by The Company of Biologists Ltd