Penguin feather, SEM

Penguin feather, SEM

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Caption: Penguin down feathers, coloured scanning electron micrograph (SEM). The penguin (family Spheniscidae) has the most densely packed feathers of any bird. Penguins have a layer of down growing beneath the main contour feathers, as well as a thick layer of fat under their skin that traps air and helps to insulate their bodies from the cold. Magnification: x50 when printed 10 centimetres wide.

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Keywords: anatomical, anatomy, animal body, barb, barbs, barbule, barbules, biological, biology, bird, coloured, down, false-colour, false-coloured, fauna, feather, feathers, filament, filaments, hook, hooked, hooks, insulating, insulation, many, multiple, nature, oil, oiled, oily, ornithological, ornithology, overlapped, overlapping, penguin, rachis, scanning electron micrograph, scanning electron microscope, sem, shaft, waterproof, zoological, zoology

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