What physical structure contributes to the upright, sassy posture of the Vermilion Flycatcher?

Answer

A relatively large head in proportion to its body size

The Vermilion Flycatcher possesses a physical build characterized by a relatively large head in proportion to its body size. When this large-headed structure is combined with its short, straight bill and short legs, the bird often maintains a distinct, upright stance while perching. This specific posture gives the bird an appearance that is often described as bold or sassy to human observers.

What physical structure contributes to the upright, sassy posture of the Vermilion Flycatcher?
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