Which mechanism causes reduced lift when flight feathers become excessively contaminated by oil?

💡 Explanation

When feathers become contaminated with oil, disrupted barb interlocking occurs because oily residue prevents the barbs from properly hooking together, which induces greater turbulence on the wing surface. Therefore turbulence reduces lift, rather than shape alteration, altered density causing stiffness, or reduced heat gain which have different effects.

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