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Key terms: feathers birds skin colors flight structures eagle dinosaurs barb tail host wing scale evolved origin powder pigments likely insulation suggested produce tracts rachis arise shaft melanin fibers follicle plumage parrots been used differences hollow observed bristles calamus carotenoid selection feathered dinosaurs integumentary been suggested vertebrates most likely feather lice evolutionary united states waterproofing thermal insulation indian peacock contour feathers Search external links cited by footnotes on Wikipedia page Feather: |
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