Which adjustment, impacting lift distribution, allows soaring birds to maintain stable flight in turbulent thermally unstable air?

💡 Explanation

When soaring birds encounter thermal turbulence, precise adjustment with aerofoil, manipulating air flow across wing via alula feather deployment occurs due to Bernoulli's principle, stabilizing leading-edge airflow, maintaining coefficient of lift distribution for coordinated flight. Therefore alula feather deployment stabilizes flight, rather than tail adjustment which alters yaw, camber adjustments requiring high speed stability, volume adjustments being unsuitable during wind gusts.

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