I added one new Bluebird House (and retired one) to my trail this spring. The Bluebirds started checking out the new house today in the stages to breeding; the wing wave. The male found the house and brought the female to it. She looked it over real thoroughly (inside and out); then the wing wave that signals mating is near and nest building will happen that same day (the new treated post is straight, camera crooked), Taken from 150′ with a Canon 50D and an EF400L f/5.6:
Life and Wildlife along the Little Buffalo River 