This particular design attracts bluebirds & tree swallows. Air vents allow for maximum air ventilation through wall & Floor openings. Clean-out door provides easy access for cleaning. A predator guard extends the entrance hole to protect young Birds against predators. An addition of fledgling skerfs provide extra grip for fledglings to climb out. The innovative design can be installed with a pole mount or flush mount. Innovative design technology is combined with superior quality for ease-of-use & long-lasting durability.