Which risk increases during avian flight when asymmetrical feather wear distorts a raptor's primary feathers?

💡 Explanation

When asymmetrical feather wear distorts primary feathers, aerodynamic imbalance occurs because lift distribution is uneven, requiring greater control surface deflection leading to increased drag, and higher stall speed, and higher energy expenditure. Therefore stall speed increases, rather than better thermoregulation, maneuverability, or parasite resistance which are unrelated to feather asymmetry.

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