Which aerodynamic benefit do avian air sacs provide during sustained soaring flight at low altitude in high humidity?

💡 Explanation

During soaring flight, constant wing adjustments generate heat, increasing skin temperature; avian air sacs facilitate evaporative cooling through internal moisture diffusion into circulation, reducing turbulent kinetic energy within the boundary layer by stabilizing airflow. Therefore, reduced turbulent drag occurs rather than stall prevention, camber manipulation, or water retention, which require different biomechanical factors.

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