|"Is this all real? Or has this been happening inside my head?"
The topic of this article is of a real-life subject that has been mentioned "in-universe" in a canon source. The Harry Potter Wiki is written from the perspective that all information presented in canon is true (e.g., Hogwarts really existed), and, as such, details contained in this article may differ from real world facts.
- "Hairy Caterpillar Guts are used mainly in Shrinking Solution."
- — Description[src]
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 (First appearance)
- Harry Potter and the Half-Blood Prince (video game)
- The Road to Hogwarts Sweepstakes
- Wonderbook: Book of Potions