Last Sunday, before I went out and cut down the asters that were going to seed, I saw a small bird among them. After some hunting for the binoculars I got it in sight just as it flew up onto a branch, where it sat posing and bobbing its tail. I'm not positive but I think it was a palm warbler in fall plumage.
We have had some cool nights--not a hard frost, but there is a white dusting on the grass in the morning. I'm guessing that the temperature change explains the morning glories' color shift: the brilliant blue blossoms now are paler and have a purple cast.