Owl post is a wizarding system of sending messages or items using owls as the carriers. Besides the Owl Post Office, individuals and organisations with their own owls use them as their mail bearers — owls are employed by wizards in such numbers that is estimated that virtually all of them are either the property of the Postal Service or individual wizards. Harry Potter's owl, Hedwig, was used as his primary means of communicating with his friends and his godfather, Sirius Black. Hogwarts School of Witchcraft and Wizardry had a number of owls that anyone at the school could use. They, along with students' personal owls, were kept in the Owlery.