Fig. 4. Aligned dive profiles during inter-deep-dive-intervals (IDDIs) for Ziphius cavirostris (A) and Mesoplodon densirostris (B). The preceding deep dive ends at minute 0 whereas the following deep dive (not shown) starts after 10-142 min (Ziphius) or 25-181 min (Mesoplodon). The decreasing trend in the depth of shallow dives with time elapsed since the preceding deep dive is apparent.