The sparrows apparently bought out the bluebirds. Times are hard. Hopefully they have family they can stay with until they get back on their feet. Or is this a case of home invasion? The bluebirds have not been seen and could not be reached for comment.
I "planted" this post and attached the bluebird house, and before I knew it - actually seems like a matter of minutes - the bluebirds were at the real estate office passing papers.