Beautiful and unique, these are designed by experienced birders and are near perfect for secondary cavity dwellers, such as Wrens, Chickadees, smaller Flycatchers, Nuthatches, Tree Swallows, Tufted Titmouse and certain Warblers. The porcelain is an excellent material to regulate temperature fluctuations and handle all the extremes of early spring and summer weather. These are easily mounted on any stable tree trunk, house or post with the hanging bracket that is included. All the Birdhouses have a removable bottom for eventual cleaning. Their cost is modest.