|"Are you a wizard or not?"
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These codes or identifiers were used by Magizoologists or the Department for the Regulation and Control of Magical Creatures to encode feeding, habitat, and physical descriptors about magical beasts.
Newton Scamander kept a list of these codes pinned inside his suitcase. These codes were also added to case files by Mathilda Grimblehawk and her partner and used as clues to help identify magical beasts.