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 created in 2005 and is played worldwide. Characters and elements from the series have inspired scientific names of several organisms, including the dinosaur "Dracorex hogwartsia", the spider "Eriovixia gryffindori", the wasp "Ampulex dementor", and the crab "Harryplax severus". The popularity of the "Harry Potter" series has translated into substantial financial success for Rowling, her publishers, and other "Harry Potter" related license holders. This success has made Rowling the first and thus far only billionaire author. The books have sold more than 500 million copies worldwide and have also given rise to the popular film adaptations produced by Warner Bros., all