The shells of the Streeler, change colour every hour and are also highly poisonous. They must be handled with protective gloves to prevent one from being harmed by their toxic shells. They are also useful potion ingredients, and are used in the brewing of Doxycide.
- Harry Potter and the Prisoner of Azkaban (First appearance)
- Harry Potter and the Prisoner of Azkaban (video game) (Appears on a Famous Wizard Card)
- Fantastic Beasts and Where to Find Them
- Wonderbook: Book of Potions
Notes and references
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