I knew you guys would be ready! Please, don't heap on any more guilt.

All kidding aside, I usually don't like to open cavities up too early because then I have to be vigilant about making sure the bluebirds stay away and, of course, once you open up - the war with the sparrows is ON. So, in the beginning of the season I only open up a few cavities and wait until more of my PM colony arrives before I'm seriously "open for business".
By the way, Steve, yesterday I had my first Hawk sighting. My husband yelled to me that a bird hit our bedroom window and he thought is might have broken it because the sound was so loud. I was looking for a small injured bird (our feeders are in the back and we get a few window strikes a week) when I saw what I thought was a large chicken under the window. I did a double take, noticed the beak and big eyes looking up at me (I think he was just as startled as I was) - both of us took a step back and gawked at one another. "It's a hawk,", I cried out to hubby, "come see!" As I turned back to have another look, he was gone. I'm sure he was after a flock of blackbirds that frequent my feeders or perhaps the mourning doves that hang around. Unfortunately for the PMs, the hawk survived to hunt another day.
Jeanne
"Look at the birds in the sky. They do not sow or reap, yet your heavenly Father feeds them."