Which aerodynamic benefit does 'alula' feather in bird wings specifically provide during low-speed flight or landing?

💡 Explanation

Alula feathers create a small slot on the leading edge which re-energizes the boundary layer airflow preventing separation even at high angles via vortex generation thereby delaying stall. Therefore delayed stall angle results, rather than lift increase, drag reduction, or boundary suction, which depend on other distinct wing mechanisms.

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