The Owlery was a room on the top of Hogwarts Castle's West Tower, where the school owls and the owls belonging to students lived during the school year. The Owlery was a circular stone room, rather cold and drafty, because none of the windows had glass in them. The lack of glass in the windows allowed the owls to come and go freely. The floor was entirely covered in straw, owl droppings, and the regurgitated skeletons of mice and voles. Many owls nestled here on perches that rose right up to the top of the tower. During the winter months, the room was very cold, to the point that one had to be careful with ice on the higher landings.