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Figure 1


Fig. 1. Examples of ECG records of emperor penguin 35 over 20 s intervals, (A) at the surface and (B,C) during diving. From this ECG record, heart rate (fH) was calculated as 214 beats min–1 (A) 12 beats min–1 (B) and 6 beats min–1 (C). Plus signs (red) represent detected peaks. The artifacts present in B and C correspond to wing strokes (as revealed by simultaneous review of stroke frequency and ECG profiles in this individual).





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