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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Are porcupine quills more like hair, nails, or a kind of hardened fur? - Quora
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Are porcupine quills like hairs or like feathers?
Are porcupine quills more like hair, nails, or a kind of hardened
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