The Owlery is a room on the top of Hogwarts Castle's West Tower, where the school owls and the students' owls live during the school year. It is a circular stone room, rather cold and drafty, because none of the windows had glass in them, in order to allow the owls to come and go freely. The floor is entirely covered in straw, owl droppings, and the skeletons of mice and voles. Many owls nest on perches that rise right up to the top of the tower. During the winter months, the room is very cold, to the point that one has to be careful with ice on the higher landings.