- "Hairy Caterpillar Guts are used mainly in Shrinking Solution."
Sliced caterpillars were used as an ingredient in the Shrinking Solution. In 1993, during a lesson on how to prepare this potion with Professor Severus Snape, Harry Potter was so angered by Draco Malfoy's admission that he was trying to get Rubeus Hagrid sacked that he accidentally cut the head off one of his caterpillars. Draco then ordered Ron Weasley to slice his caterpillars for him on the pretence that his arm injury prevented him from doing so himself.
- Harry Potter and the Philosopher's Stone (film) (Appears on product label)
- Harry Potter and the Prisoner of Azkaban
- The Road to Hogwarts Sweepstakes
- Wonderbook: Book of Potions