by Carl Strang
I was taking a walk at the Morton Arboretum a couple days ago when a male bluebird landed in a small tree nearby.
Soon his mate appeared.
They were going in and out of a natural tree cavity.
This was exciting, for me. I have been concerned that bluebirds may be going the way of purple martins, recognizing only bird houses provided by people as suitable nest sites. This pair may or may not use that cavity in the end, but the fact that they are considering it is a positive sign. They, at least, have not irreversibly imprinted on nest boxes as candidate nest sites.