Together with Fantastic Beasts and where to find them, the Monster Book of Monsters is used as a textbook for the Care of Magical Creatures Class in Harry's Third Year.
Hagrid sent this book to Harry as a present for his 13th Birthday, when Harry opens Hagrid's package, the binding of the book snaps and bites at him.
The Monster Book of Monsters has to be kept in a cage.
Prisoner of Azkaban: "A loud ripping noise rent the air; two of the Monster Books had seized a third and were pulling it apart.
"Stop it! Stop it!" cried the manager, poking the walking stick through the bars and knocking the books apart. "I'm never stocking them again, never! It's been bedlam! I thought we'd seen the worst when we bought two hundred copies of The Invisible Book of Invisibility - cost a fortune, and we never found them ... Well... is there anything else I can help you with?"
