Which effect occurs when avian wing feathers experience excessive wear reducing barb overlap?

💡 Explanation

Excessive feather wear causes a reduction in barb overlap, leading to increased air leakage through the wing because this disrupts the aerodynamic smoothness, hindering lift generation efficiency. Therefore, reduced lift efficiency results, rather than decreased stall angle, improved insulation, or enhanced camouflage, which depends on different feather attributes.

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