In the East, Purple Martins are attracted to bird houses with multiple apartments to establish colonies. This house opens on four sides for easy cleaning and mounts securely on a pole. RANGE: Breeds from British Columbia, central interior Canada and Nova Scotia southward, but absent from interior western mountains and Great Basin. Winters in tropics. Measures approximately 18" h x 17 1/2" w x 17 1/2" d. Made in Maine from eastern white pine.