Thanks for the additional info.
My wood ducks only make due with the natural cavities they find in the woods along our creek. If I ever get caught up on my 100 other projects, I want to copy some of your duck boxes.
By the way, you are the 2nd PB member to have a screech owl in their duck nesting boxes over the past year.
Perhaps we need to create a little more screech owl habitat in our wildlife support projects!