SCIMAT / SCIENCE PHOTO LIBRARY SCIMAT / SCIENCE PHOTO LIBRARY
Feather quill interior by SEM. As a fracture shows, the interior consists of a pithy material that contains air cells to make the quill light yet strong. This feather is from a common grackle (Quiscalus quiscula), now the most abundant type of breeding bird in North America and considered a significant pest in many areas because it feeds on agricultural grains and seeds, especially corn. Enhanced SEM. Image width: 174 micrometers. Bar: 20 micrometers. Magnification: 575x if the image is printed 10 cm wide.
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