The Owlery is a room on the top of Hogwarts Castle's West Tower, where the school owls and the owls belonging to students live during the school year. The Owlery is a circular stone room, rather cold and drafty, because none of the windows have glass in them. The lack of glass in the windows allows the owls to come and go freely. The floor is entirely covered in straw, owl droppings, and the regurgitated skeletons of mice and voles. Many owls nestle here on perches that rise right up to the top of the tower.