SUMMARYTo investigate the diving heart rate (f H ) response of the emperor penguin (Aptenodytes forsteri), the consummate avian diver, birds diving at an isolated dive hole in McMurdo Sound, Antarctica were outfitted with digital electrocardiogram recorders, twoaxis accelerometers and time depth recorders (TDRs). In contrast to any other freely diving bird, a true bradycardia (f H significantly
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