Which physiological adjustment balances increased wing loading for migratory birds during long flights encountering headwinds?

💡 Explanation

When migratory birds encounter headwinds, their effective wing loading increases, requiring more power; thus, erythropoiesis boosts oxygen-carrying capacity because more red blood cells improve sustained muscle performance for prolonged exertion. Therefore, birds increase red blood cell count, rather than adaptations associated with thermoregulation, metabolism or digestion.

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