These are all sized for bluebirds and swallows
One of our neighbours saw 5 bluebirds on the fence line the other day.
On our property they seem to like to nest further back, by the fields, as they like the open spaces.
Here, near the house (and on the house) we have more luck attracting swallows which are great little bug catchers and lovely to watch swooping and diving.
I think I may have heard a bluebird the other morning. They have a sweet mournful voice.
Birdhouse # 2.