Fig. 2. An example of dives (black line), dorso-ventral acceleration (green line) and pitch angle (grey line) of a shag (03F4) during a foraging trip between two landings. Periods ashore in the colony, in flight and in dive bouts are indicated as grey, orange and blue bars at the top, respectively. Values on the orange bars are dominant stroke frequencies (Hz), and values in parentheses are estimated body masses (kg).