Every Fall I get one or two warblers - usually Chiffchaffs, passing through my garden on their way southwards. They're not interested in the feeder offerings per se, but I guess the layer of seeds the other birds drop, and of course the shrubs nearby, are hosts to enough bugs that it's worth their time to spend a few days in my garden. Always a joy to see them, even if it is a sign of impending winter.