MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Hummingbird feather, coloured scanning electron micrograph (SEM). The central shaft, or rachis runs down the centre. 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. A hummingbird's feathers are light but very strong. Magnification: x52 when printed at 10 centimetres wide.
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