Are porcupine quills like hairs or like feathers?

Porcupine quills are hollow, like feathers, and are made from the same material, but then so are hairs, and fingernails, and claws and scales. The quill is a unique adaptation of one of nature

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Length as you choose. Please understand that these are real specimens, so quills will vary in pattern and thickness as shown. African porcupine quills

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Photographs of porcupines and their quills: (a) Hystrix (provided

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