The entrance hole of this bluebird house is sized at 1-1/2 in. This just-right size can attract many popular bird species such as bluebirds, wrens, tree swallows, and chickadees to make their homes here. At the same time, it can effectively keep out unwanted predators and uninvited guests like European starlings. The birdhouse is made of untreated and unpainted cedar, which is of high quality. The rough surface of the cedar makes it convenient for birds to get a foothold when they enter and exit the house, and it can also withstand damage caused by the weather. There is a copper predator guard around the entrance hole, providing safety for the fledglings. The grooves inside the house are like small ladders, helping the fledglings, especially swallows and bluebirds, to leave the birdhouse smoothly. Assembling this bluebird house is both easy and fun. With just a screwdriver, you can experience the joy of building it together with your family. While creating a nest for the little birds, you can also gain a great sense of pride. You can also unleash your creativity and paint it DIY to make the birdhouse unique. After the fledglings have left the nest, the front door of the birdhouse can be opened for easy cleaning. When the season is over, you can clean the birdhouse thoroughly and keep it for reuse next spring. Color: Brown.