What subtle crown marking distinguishes adult male Red-cockaded Woodpeckers?

Answer

A small, almost invisible red streak on their crown feathers

The Red-cockaded Woodpecker, noted as a federally endangered species primarily found in the southeastern United States, presents a subtle contrast in coloration compared to its larger relatives like the Pileated Woodpecker. This smaller bird displays black and white barring on its back and a distinctive white streak above the eye. While the species name suggests redness, the male possesses a remarkably subdued marking: a small, nearly imperceptible red streak located on its crown feathers. This contrasts sharply with the bold, conspicuous red crests often sported by other, larger woodpecker species.

What subtle crown marking distinguishes adult male Red-cockaded Woodpeckers?
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