This morning, though, ensconced at my desk to try to work on taxes, I spotted a male bluebird pausing on one of the feeder poles. He flew on, and I watched...to see him head for the birdhouse. A little later I spotted a female bluebird clinging to the outside, poking her head inside. Then she left and the male emerged from the hole. By now bluebirds should be hatching their young, I think, so either this pair is quite late or they've been using the birdhouse for a while and I've just been oblivious. I'll be watching from now on, for sure.
In other morning bird activity (anything to avoid the taxes), the goldfinches are enjoying the thistle sock--maybe 2 pairs, certainly 3 males are around. A downy woodpecker has found the backyard suet block (been working on the front one for a while), a brown headed nuthatch has joined the house finches, titmouses, chickadees, etc. on the tube feeder, and an Eastern towhee pair are scouting for seeds on the ground. The cardinals and red-bellied woodpecker are sticking to the front yard--I think the feeder there is the only one they can fit on. The white-breased nuthatch and the cardinals are also front yard only, at least lately.