The porcupine quills can grow up to about 12 inches! The longest ons are on their backs and lots of people actually use them for jewelry. The quills don’t get pulled out as they are really securely fastened to the body, but at times they do fall out, and then a new one grows in its place.
Porcupine quills are generally anywhere from half an inch to four inches long in length. They are actually special hairs, with a follicle attached to the skin, a shaft, and then a barbed tip at the end. The tip is layered with many barbs rather than just one, making it go deeper into the victim’s skin. A porcupine has about 30,000 quills in all, covering its entire body, and uses them as a defense when they feel threatened.
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