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Information about Barbule

Barbules are a part of the tree formed by feathers : the trunk, or axis, being the rachis and the barbs the main boughs, barbules are the secondary branches. Barbules have minute hooks called barbicels for cross-attachment.

References

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Feathers are one of the epidermal growths that form the distinctive outer covering, or plumage, on birds. They are the outstanding characteristic that distinguishes the Class Aves from all other living groups. Other Theropoda also had feathers (see Feathered dinosaurs).
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Barbs are a series of branches fused to the rachis of a feather. The barbs themselves are also branched and form the barbules.

References

  • http://www.1911encyclopedia.org/F/FE/FEATHER.htm

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