Maybe I haven't seen them because I'm not out where I CAN see them often enough. But anyway, I was out on the patio about 3:45 this afternoon and noticed a hummer at the feeder; too far off for my old eyes to identify, so I came in and got my binoculars, went back out, and sat on the patio for about 20 minutes. Twice during that time, a hummer came to feed a bit; not sure about the first one, but I do know the second time it was a Ruby Throated Hummingbird, may or may not have been the same one each time.