Experienced bluebird landlords should recognize which subtle behaviors as signs of stress in nesting parents?

Answer

Excessive tail-flicking or continued agitated calling.

Even if a bluebird refrains from physical aggression, an experienced caretaker can identify stress through subtle signals such as excessive tail-flicking or persistent agitated calling directed toward the human observer.

Experienced bluebird landlords should recognize which subtle behaviors as signs of stress in nesting parents?
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