Which effect results when feather barbules lack functional interlocking hooks during avian molt?

💡 Explanation

When barbules lack interlocking hooks, the feather structure loses cohesion because the hook-and-barb system normally links adjacent barbules, maintaining a smooth, aerodynamic surface. Therefore reduced flight efficiency results, rather than increased insulation, enhanced camouflage, or improved water repellency, each which require ordered microstructures.

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