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The biology of birds. Birds. EXTERNAL FEATURES 17 QW the minute structural differences between feathers are seldom adaptive, which-increases their taxonomic value. As many a bird can be identified from a
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Comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates. INTEGUMENT 27 down1 becomes covered or replaced by the more complicated definitive contour-feathers, the proximal barbs of which usually still retain their down-like character.
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