Which risk increases when feather barbules lack sufficient microhook interlocking during avian flight?

💡 Explanation

Weak barbs reduce cohesion because feather structure is compromised, creating gaps that disrupt smooth airflow, undermining its aerodynamic properties, thus inducing performance losses. Therefore, aerodynamic efficiency decreases, rather than turbulence, insulation, or maneuverability changes, all of which require different physiological effects.

• Which risk increases when asynchronous feather molting occurs?
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