Feathers
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“A., Filoplume. B., very young feather within its sheath (sh.); c., the core of dermis; b., the barbs. C., the same, external view.” -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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