If you have bluebirds in your area, and you want to provide them a place to feed, you can find out how to build little bird houses for them.  The one thing you should keep in mind is that bluebird houses are more than just a bird feeder for bluebirds, they are homes in which they can live.  Many people have become more aware of the fact that due to land development, bluebirds are looking for places to live in populated areas.  If you build a bird house for bluebirds, make sure to use cedar, plywood or redwood and stay away from chemically treated wood for your birdhouse.