An Animagus (plural Animagi) is a witch or wizard who can change into an specific animal at will. Becoming an Animagus is quite difficult and time-intensive, and generally only very skilled witches and wizards succeed. Because the transformation can possibly go wrong, Animagi are required to register with the Ministry of Magic (though within the Harry Potter series, several characters are unregistered). An Animagus's animal form is a reflection of his or her inner nature, and may also contain identifying features such as glasses.
 Known Animagi
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