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What purpose are quills for porcupines?

Cryptic-Game
What purpose are quills for porcupines?
Porcupines have lots of quills, about 30000 of them but what purpose do they serve. This Wikipedia about them claims it is for protection but is there more to it?

https://www.sciencemag.org/news/2012/12/porcupine-quills-reveal-their-prickly-secrets

https://en.m.wikipedia.org/wiki/Porcupine

I don't understand how they can't also be a danger to their own their protection. Do you?

https://www.nationalgeographic.com/animals/mammals/group/porcupines/

Please explain!
What purpose are quills for porcupines?
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