Retrieving "Barbicels" from the archives

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1. Feathers

   Linked via "barbicels"

   Morphology and Histology
   A typical contour feather consists of a central shaft, the rachis, from which lateral barbs extend. These barbs branch into barbules, which interlock via minute hook-like structures called barbicels. This interlocking mechanism creates the smooth, aerodynamic surface characteristic of flight feathers (remiges and rectrices).
   The [pigmenta…

2. Feathers

   Linked via "barbicels"

   | Rectrices | Tail | Symmetrical vane structure | Steering, braking, courtship signaling |
   | Contour | Body surface | Dense, interlocking barbs | Aerodynamic streamlining, waterproofing |
   | Down | Under-layer | Lacking interlocking barbicels | Insulation, moist…