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Showing 1 to 1 of 1 for “"dark facial markings"”.
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Glare Reduction by Dark Facial Markings and Bills in Birds
<p>Avian facial plumage, bill coloration, and feather microstructure may serve one or more adaptive functions. Several researchers have proposed that dark eyestripes, bills, and facial masks aid in reducing glare, however, there have been relatively few tests of this hypothesis. Dark facial …