Bluebird Houses

Bluebirds are referred to as "cavity nesters" meaning they nest in holes. With declining opportunities for nesting in natural holes, Bluebirds have adapted very well to man-made cavities, i.e. nesting boxes. However, Bluebirds have a hard time repelling cowbirds and competing with the migratory Tree Swallows and the exotic and invasive House Sparrow, introduced from Europe. Since these battles can be un-ending and often disastrous, many owners will put out multiple houses hoping to dilute the pressure. Some put the boxes back to back and others spread them around. Putting up bird houses is a responsible but very worthwhile and enjoyable hobby.