Bird houses come in a variety of styles and sizes. There are some bird houses that are meant for a specific bird, like blue birds or purple martins. Some are much more decorative to fit with different landscapes.
Birds are not the only critters that need houses. By providing a shelter for bats, you now have a great bug catcher. Butterflies can also be a great addition to any back yard. Look in our Other Houses section for shelters for critters other than birds.