Abstract: A cage having a plurality of side walls, wherein an entire one of the side walls is formed by a wall door. The wall door is hingedly attached to a side edge of an adjacent wall. The wall door may be opened and closed, to provide for easy access to the interior of the cage, for cleaning, changing the larger equipment required by larger birds, and for other purposes. The wall door is provided with a small door, which covers an opening in some lesser part of the wall door, and can be opened and closed independently of the wall door.