I was even more surprised when I got home to find that there was also a pair checking out a woodpecker cavity in the dead birch tree in my front yard! (The downy woodpeckers excavate these holes, but to the best of my knowledge, they have never used them for nesting.)
Here's a nice shot of Mr. Bluebird.
Here's Mrs. Bluebird on a Gilbertson PVC house.
And here's Mrs. Bluebird waiting for Mr. Bluebird to come out of the tree cavity.
And here's one more short movie, because I just can't get enough of these birds!
And don't forget about the Minnesota Bluebird Recovery Program spring conference coming up this Saturday in Elk River, Minnesota. There's a link on my sidebar if you want more information or would like to attend.