Which aerodynamic mechanism causes increased thermoregulation efficiency in soaring birds during flight?

💡 Explanation

During flapping, air sacs inflate, creating a bellows action, with counter-current exchange within the parabronchi of the avian lung optimizing oxygen extraction and regulating body temperature to counter overheating during exertion. Therefore ventilation from air sac action results, rather than conduction, radiation, or evaporation which are limited by insulation or surface area constraints.

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