Which risk escalates if avian primary feathers lack sufficient interlocking barbules?

💡 Explanation

If interlocking barbules are insufficient, feathers lose cohesion impacting leading-edge airfoil shape to maintain lift and prevent turbulent airflow and stall at lower airspeeds. Therefore airfoil stall risk increases, rather than insulation, mites, or bone density, which relate to feather structure or diet influencing bird resilience.

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