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. 2021 Mar 31;7(14):eabf5908. doi: 10.1126/sciadv.abf5908

Fig. 3. Risso’s dolphin and Cuvier’s beaked whale foraging behavior off Terceira Island, Azores.

Fig. 3

Example 17-hour and 24-hour dive profile (orange line) and associated foraging vocalizations of Risso’s dolphin (G. griseus; gg15_229a; top) and Cuvier’s beaked whale (Z. cavirostris; zc18_185a; bottom). Echolocation signals (clicking and buzzes) emitted by the tagged individual define foraging effort. Clicking (gray thicker outline) indicates prey search. Buzzes (yellow circles) are emitted at close approach of a target, indicating a prey capture attempt. Both species perform different foraging dive types: Risso’s dolphin, mesopelagic (MESO) and shallow (SH); Cuvier’s beaked whale, deep-wide (DW) and deep layer–restricted (DLR). Gray rectangles, bottom depth at nearest distance from foraging whale; white rectangle, bottom not detected, minimum depth of nearest bottom; gray bands, schematic representation of depth of the deep scattering layers at the Azores (25).