EDWARD KINSMAN / SCIENCE PHOTO LIBRARY EDWARD KINSMAN / SCIENCE PHOTO LIBRARY
SEM of a Porcupine Quill. This is a quill from a porcupine. The quill is designed to stick into the skin of a predator and not be easily removed. This is an effective defensive mechanism for the porcupine. False color Scanning Electron Micrograph (SEM).
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