Porcupine quills were the sharp spines that covered porcupines, defending them from predators. Porcupine quills were plentiful since the animals continually replenished them.
- Harry Potter and the Philosopher's Stone (First appearance)
- Harry Potter and the Philosopher's Stone (video game) (GBC version only)
- Harry Potter and the Half-Blood Prince (video game)
- The Road to Hogwarts Sweepstakes
- Wonderbook: Book of Potions