Porcupines are large rodents with coats of sharp spines, or quills, that protect them against predation. Crested porcupine · Andean porcupine · Cape porcupine · Malayan porcupine |
Taking a design cue from the animal world, mimicking a porcupine quill might help make a more effective—and less painful—needle. |
27 июл. 2022 г. · Quills are simply hairs that have evolved to have certain protective attributes. Quills are loosely held by a porcupine's skin. |
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