In the East, Purple Martins are attracted to houses with multiple apartments to establish colonies. This house opens on four sides for easy cleaning and mounts securely on a pole.(18"h x 17-1/2"w x 17-1/2"d) RANGE: Breeds from British Columbia, central interior Canada and Nova Scotia southward, but absent from interior western mountains and Great Basin. Winters in tropics. HABITAT: Seeks open woodlands, residential areas and agricultural land.This item cannot be expedited.