Which risk increases for birds relying on soaring flight when asymmetrical feather wear develops?

💡 Explanation

When asymmetrical feather wear occurs, increased drag results because the disrupted airfoil negatively impacts the ability to efficiently capture lift from rising thermal currents, compromising soaring flight. Therefore increased drag occurs, rather than metabolic increase, reduced maneuverability, or premature molt, each requiring different biomechanical stresses.

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