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Welcome to the Harry Potter Wiki, and thank you for your attempt to help. However, at this time, I am going to ask that you stop adding categories to articles until you are more familiar with our category structure. There's a reason the "Creatures" category was not already present on those pages-- if it's already in another subcategory such as "Fire-based creatures," then we don't add that category too. ProfessorTofty (talk) 19:06, December 29, 2012 (UTC)