Magorian is a centaur. He has a chestnut horse body, "a proud, high-cheekboned face and long black hair" (30.203). He is a member of Firenze's former herd and one of its apparent leaders. While Magorian does not allow the considerably more warlike Bane to kill Harry and Hermione as he wishes to (because they are "foals" (30.218), he does believe that centaurs should not be talking to lowly humans. What is more, Magorian does not want to keep sharing the forest with Grawp. This puts Hagrid's back right up: he shouts, "Yeh'll tolerate 'im as long as he's here, it's as much his Forest as yours!" (30.224). But honestly, we think Magorian has a point. Would you want to share the Forbidden Forest with a giant, even a relatively small one?