Safe nesting sites are always in short supply for cavity-nesting birds. Unfortunately, the vast majority of the birdhouses available are more decorative than functional. After extensive research, we have found several small US companies that use only plantation-grown pine or non-aromatic western cedar to construct durable birdhouses. These exacting birdhouses get results - we personally installed and field-tested all of them in both eastern and western North American locations. The natural, unpainted rough wood surfaces let young birds crawl around inside as they would in natural cavities. All incorporate ventilation, drainage, and easy cleaning features and come with suggestions for installation (location, height, etc).