The occurrence of D calls on a dive profile. The occurrence of D calls on a dive profile. Eighty-one D calls from deployment bm15_054a are mapped on the tag's depth profile, with the 36 calls registering detectable acceleration (acc.) signals shown in red and the 10 calls with highly intra-correlated acceleration signals marked in yellow. Calls shown in blue did not register detectable accelerometer signals. Green squares indicate feeding lunges identified in the DTAG record. Mark R. Saddler et al. J Exp Biol 2017;220:4119-4129 © 2017. Published by The Company of Biologists Ltd