What visual cue is a common identifying feature of the Eastern Phoebe, even when it is simply waiting on a perch?

Answer

Its characteristic tail-wagging motion

The tail bob or tail-wagging motion is a characteristic visual cue common to the species, present even when they are perched waiting for a meal.

What visual cue is a common identifying feature of the Eastern Phoebe, even when it is simply waiting on a perch?
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