There was lots of activity at my downtown backyard feeders this am including a pair of hairy woodpeckers, so I looked more closely than usual and saw a large white puffy tuft at the rear of the female's beak. Sibley calls this out for the female downy - "conspicuous tuft of nasal bristles" but the drawing for the hairy looks small and flat in that region. Does anyone know if the bristles have an erectile function?

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