These 100% rough cut cedar,  wood burned and painted, birdhouses were built specifically for attracting nesting Eastern Bluebirds. They have a swinging side panel for easy cleanout, ventilation, wooden and metal predator guard and pre-drilled holes for hanging. The Eastern Bluebird starts nesting in February in Tennessee so plan on buying soon. I built and hung 6 on the farm last year and all were used. We had lots of baby bluebirds.