Recently, I wondered if I would put a nesting box in my yard, if they would come to visit. Apparently, I don't need a nesting box at all! I also saw a younger bird which still had it's spotty plumage. The photo I shot of it wasn't my favorite, though.
...and a little haiku to round out the post, HA!
Feathers of bright blue;
Happy notes chirp from your beak!