Fig. 2

Plots of norm-jerk signals and dive depth for one blue whale (bw10_240b) and one Risso’s dolphin (gg13_262b). Plots on the top for each individual show the norm-jerk signals that were passed through detect_peaks. Default and optimized detections are labeled with their corresponding threshold levels. The bottom plots for each individual represent the dive depth of each animal with known feeding attempts and the optimized detections marked on the plot. Note that the optimized and default thresholds for the Risso’s dolphin are almost identical, thus seemingly overlapping in the figure. The sampling rates for this blue whale and Risso’s dolphin were 5 Hz and 25 Hz, respectively