Oh thanks goodness, if it were HOSP which my male eastern BB just chased it off. Hopefully our native Blues will claim victory in the garden agaisnt the HOSP. I'll wait for confirmation of its i.d. Thanks Chillybean.
Those lovely Blue Birds are careful nest selectors. It took my nest a year of vacacy. The Blues came to inspect it but didn't settle in the first year. Until this spring and I encouraged them by providing meal worms feeder nearby. That sealed the deal so to speak. Once again, thanks to both. I can now close the thread.