Thanks to all of you who have suggested what sort of bird I might be seeing here. I checked out each suggestion by typing it in Google images and checking out both male and female of the species.
Several of you thought it might be a female barn swallow. We have hundreds of those around, since we live behind a barn. Cliff considers them a nuisance, and I guess they are. But I love to watch them in flight. Anyhow, the mystery bird (I should say birds, since there are several) is not a swallow; of that I am certain. No forked tail.
I have turned into a total slob this summer. I gave myself over to gardening and canning at the expense of any housekeeping. Now I have thrown myself at the feet of Flylady, asking her to either help me out or beam me up. You can bet I'll fall off the wagon eventually; I always do. I'm not even sure I ever get totally on the flylady bandwagon, but things do look better around here when I make the attempt.
So, I'm de-cluttering a little: I finally got the nerve to ask Cliff to get rid of the baby crib that both my children slept in as infants. I did, however, keep the end panel of the bed with the Mobil Oil Pegasus that Cliff, as a teenager, put there for his baby sister, Charlene. It has many toothmarks left there by my son, and I'm sure by my daughter also; although she wasn't as dedicated a chewer as Jimmy was.
So now I have space in my computer room for a daybed, preferably with a trundle. That way when my son and his family come to visit, there's a place for my Georgia granddaughter to sleep; and with a trundle, there's a spot for another granddaughter to spend the night while she's here. I've been watching Craigslist, but without any luck so far. I really don't want to spend as much money as it would take to buy a new one.