Fig. 5. (A) Heart rate of foraging Greenland great cormorants throughout the year cycle. Filled circles, heart rate (HR) of birds at the water surface in-between dives; empty circles, heart rate of birds in the deepest section of dives. The latter are also the lowest heart rates during the dives. One data point is shown every eighth day; values are means + S.D. (N=3-7). (B) Heart rate of resting Greenland great cormorants throughout the year cycle. Filled circles, heart rates of animals resting during the non-active phase (2:00-5:00 h); empty circles, heart rates of animals resting during the active phase (10:00-15:00 h). One data point is shown every eighth day; values are means + S.D. (N=3-7).