MANFRED KAGE / SCIENCE PHOTO LIBRARY MANFRED KAGE / SCIENCE PHOTO LIBRARY
Hummingbird feather, coloured scanning electron micrograph (SEM). The central shaft, or rachis runs from lower centre towards bottom right. 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: x15 when printed at 10 centimetres wide.
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