The Owlery

The Owlery is a chamber in Hogwarts School of Witchcraft and Wizardry where owls belonging both to the school and to individual students are keps. The owls are used fow Owl post communications. When in hiding, Sirius Black advised Harry Potter to send communications using owls other than just Hedwick so that it would be less likely for Sirius' hiding place to be traced, since Hedwick's breed was distinctive and easy to spot.