Abstract: A bird house or feeder assembly, used to construct a bird house or feeder from a container such as, but not limited to, a plastic milk jug or two liter soda bottle. In one embodiment, the assembly includes a roof structure, a perch and entrance ring assembly, and a bracket assembly. The roof structure is made up of a skirt piece and a crown piece which attach to the container when constructing either a bird house or feeder, by placing the skirt piece around the container spout, screwing the container cap onto the spout to clamp the skirt piece in place, and then attaching the crown piece to the top of the skirt piece. The perch and entrance ring are then attached to the container to make a bird house. In a second embodiment, the assembly includes a roof structure, a feeder pan, and two bracket assemblies. The roof structure is attached to the container in the same fashion as the first embodiment, but then the feeder pan is attached to the container to make a bird feeder.