Down feather, SEM

Down feather, SEM

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Caption: Single barb from a down feather. Coloured scanning electron micrograph (SEM). Rows of filaments, known as barbs, project from either side of the rachis (central shaft) of a feather. Along the length of each barb are smaller filaments, known as barbules. Downy feathers insulate a bird. Very young birds are clad only in down. Magnification: x250 when printed at 10 centimetres wide.

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Keywords: anatomical, anatomy, animal body, barb, barbs, barbules, biological, biology, bird, coloured, down, downy, false-coloured, fauna, feather, feathers, insulation, nature, rachis, scanning electron micrograph, scanning electron microscope, sem, shaft, structure, zoological, zoology

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