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We report the first measurements of heart rate (f H ) and the rate of oxygen consumption (V O2 ) during flights from a species of bird larger than 500 g. V O2 was obtained from nine forward flapping flights of 8.9 min mean duration at a mean speed of 13.2 m s -1 performed by three barnacle geese of mean mass 1.68 kg. Mean V O2 was 332 ml...
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