Here is a story from the 1941 Alaska Miner..
So what do you think?
Can a porcupine actually throw his quills or not??
A porky swats with his tail, and it stands to reason that if some quills find their mark other quills would fly, caused by the sudden stop of the said tail. The skin of a porcupine is not attached to the animal’s flesh in the same way that a banana is not attached to the peeling, which means the quills are loosely hanging in the skin. Now, that’s everything I know on that subject and it graphically explains why bananas can be so dangerous. f