Which aerodynamic effect relies on feather barbule microstructure during avian fight or flight?

💡 Explanation

During avian flight, feather barbule microstructure enhances boundary layer adherence because they create tiny air channels that maintain laminar flow over the wing surface, preventing stalls. Therefore, boundary layer adherence results, rather than soaring, vortex disruption, or drag reduction, which depend on different air flow parameters on the feathers.

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