This research, which Charlie throws himself at wholeheartedly when he isn’t studying or playing Quidditch or hanging out with friends, leads to him doing research on magical pets, such as kneazles and owls and toads—and rats. Rats, Charlie realises, are not typically magical pets, but are often used for potions testing and the like, and so there must be a way to make them magical. Luckily, Charlie’s younger brother, Percy, had found a garden rat five years ago, and kept it as a pet. Perfect for experiments!