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Key terms: feathers birds skin colors flight structures dinosaurs pigments eagle species suggested powder host tracts rachis melanin tail follicle been used arise scale shaft plumage parrots evolved bristles selection evolution carotenoid differences been suggested thermal insulation feathered dinosaurs contour feathers feather lice fish indian peacock hollow barb calamus functions regions united states serve grow waterproofing integumentary Search external links cited by footnotes on Wikipedia page Feather: |
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