This design is popular because it discourages cats and other predators. Since the bottom tapers, less nesting material is needed. The front opens easily for observation and cleaning. Mount this box high on a post so that potential occupants can be easily observed from a distance. RANGE: Breeds east of the Rockies from southeastern Canada to Gulf of Mexico. Winters in southern part of breeding range and Mexico. Measures approximately 17" h x 7" w x 9" d. Made in Maine from eastern white pine.