Which risk increases for a migratory bird when feather barbules fail due to parasitic mite infestation?

💡 Explanation

When barbules fail due to mite damage, airflow separation occurs because the feather's airfoil shape is compromised preventing smooth passage of air. This negatively impacts lift and control, leading to decreased flight maneuverability. Thus, impaired maneuverability results, rather than insulation, buoyancy, or immunity, which depend on other feather properties.

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