Feather Parts
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“Parts of a feather. I., Four barbs (B.) bearing anterior barbules (A.BB.) and posterior barbules (P.BB.); II., six barbs (B.) in section, showing interlocking of barbules; III., anterior barbule with barbicels (H.).” -Thomson, 1916
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Bird AnatomySource
J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)
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