Hummingbird Farewells?

I suppose because there has been so much rain, we've been hanging around the house a bit more than usual. Among other things, it's given us the opportunity to view our hummingbird feeder more frequently. In the last few days, it's suddenly been very busy at the feeder. Of course, we have no good way to tell if this is activity is all one hummingbird or different hummingbirds. But, it has definitely been a pleasure. The little guy in the picture hang around for a couple of hours in the rain. He'd rest in the ninebark shrub, have a good, long drink and then return to the shrub. We've never witnessed such a thing before! He even chased off another little hummingbird a couple of times! Although it's a joy to watch, it's rather sad, too. It means to us that the hummingbirds are getting ready to head south. They always leave early - and who can blame them, a small bird like that probably can't take too much frost, and frost could come at any time now.