Another Barn Owl nest box originally, but also no longer published by Bird
Studies Canada, has a 10" by 18" floor, is 16" tall, and has a 6" by 6"
opening near the floor. A hinged door near the floor provides access for
cleaning. This nest box could be mounted on a post, teee,
or wall, even an inside barn wall as the Barn Owl name implies.
Bird Studies Canada Barn Owl Nest Box