Despite there being several unregistered Animagi in the 20th century, there were only seven Animagi who were registered as such in the register maintained by the Ministry of Magic. One of the registered Animagus was Professor Minerva McGonagall, who could turn into a cat at will. Another registered Animagus was Talbott Winger's mother, who could transform herself into a white swan. Talbott Winger himself was an Animagus and could take the form of an eagle but was unregistered. While Talbott Winger never appeared in the books, he was a character in the Hogwarts Mystery videogame. The five of the other registered Animagi of the 20th century are never mentioned in any of the Harry Potter books or derivative material.