Porcupine is very edible, but I doubt any of his quills were kept
for additional use. Anyone ever held a porcupine quill box or embroidered knife sheath?
Actually yes. I have a quilled neck knife sheath and a bag. However I see killing and eating a porcupine as no different than killing and eating a chicken. As there is no shortage of chicken feathers, I'm not aware of any shortage of porcupine quills either. I really so don't see the problem here.
Cheers,
Tom