🚀 go-pugleaf

>Question: how readily do nuthatches accept birdhouses, and
>what kind of comercially-made birdhouse (if any) is best suited for them?

Any bird house with a 1-1/2" opening and a deeper chamber (8" or more) sould be
fine, however, just when you think you have the perfect box for them, they
choose something else: a wood duck box!  Yes, I said wood duck.  The past three
years a pair of white-breasted nuthatches has nested in a wood duck box just 20
feet from my watching window.  Their nesting behavior is quite interesting.
The male will do a "cross-hatch" routine with his bill full of insects all over
the entire surface of the box, presumeably to "mark" his territory.  Next, he
wedges bits of food in the nubby bark of the tree: suet and black-oil sunflower
seeds.  All the while, the female hangs out of the entrance hole seemingly
encouraging him on (oh, shades of allelomorphism).  I often wonder if this
caching behavior teaches the juvenile upon fledging how to forage for food in
the bark of trees?
Louise Dawson