Harry Potter and the Prisoner of Azkaban attacked by a big black dog, which Harry has seen several times before. The dog drags Ron through a tunnel under the Whomping Willow into the Shrieking Shack. Harry and Hermione follow, and there is a brief standoff when they find Ron with Sirius Black, who has transformed from the dog. Lupin enters, and they explain the situation to Harry and his friends: Lupin is a werewolf, which led to his friends James Potter, Sirius Black, and Peter Pettigrew becoming animagi. Lupin explains that Scabbers is Pettigrew in his animal form; he has been hiding from Black, whom he had
Harry Potter non-fiction, and initially counting only hardback sales. The move was supported by publishers and booksellers. In 2004, "The New York Times" further split the children's list, which was still dominated by "Harry Potter" books into sections for series and individual books, and removed the "Harry Potter" books from the section for individual books. The split in 2000 attracted condemnation, praise and some comments that presented both benefits and disadvantages of the move. "Time" suggested that, on the same principle, Billboard should have created a separate "mop-tops" list in 1964 when the Beatles held the top five places in its list,