MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Pigeon feather, coloured scanning electron micrograph (SEM). The central shaft, or rachis runs from upper right to lower left. Rows of filaments, known as barbs, project from either side of the rachis. Along the length of each barb are smaller filaments, known as barbules. The closely packed barbules insulate the bird. Magnification: x32 when printed at 10 centimetres wide.
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