Which outcome occurs when bird feathers lack sufficient barbule interlocking hooks during preening?

💡 Explanation

When barbule hooks are insufficient, interlocking is impaired and feather vanes separate because cohesive force is reduced leading to increased drag during flight caused by disrupted airflow. Therefore, reduced flight surface aerodynamic integrity results, not infestation, pigment degradation, or cutaneous receptor deactivation needing different variables.

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