The Ritz Carlton of all birdhouses.  This homemade bird house is a gem-your neighbor's birds will be jealous.  Approx 20"x7.5 and 15" tall. There are 4 separate areas for the birds to move in. You can clean it out easily-just need a screwdriver.  This fits perfectly on a 4x4 post. 

Photo 3 in the bottom of the birdhouse-it fits over a 4x4 post