Which performance change results when avian wing feathers become contaminated with oil?

💡 Explanation

When feathers are contaminated with oil, disrupted barb interlocking impairs the capacity to generate lift, effectively negating smooth airflow caused by induced drag affecting laminar boundary. Reduced efficiency and increased weight hampers maneuverability compared with clean feathers. Therefore weight increase and efficiency decline results, rather than enhanced ability to perform different flight skills which require other conditions. Insulation also drops.

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