Which risk increases during high-speed avian flight utilising slotted wings?

💡 Explanation

When birds fly at high speed utilizing slotted wings, the slot geometry enhances the energy of the boundary layer reducing pressure-induced separation, allowing a higher angle of attack, but also results in increased vortex shedding behind each feather; therefore induced drag increases because increased vorticity causes energy losses overcoming pressure benefits, rather than stalled airflow or weight increase which are less pronounced aspects of induced drag.

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