It never occurred to me to try this! You've just given me my new winter funtime project. I'm going to wait until the snow flies and less people are tending thier feeders (unfortunately - but this is how it is in my neighborhood). Less choices for them might mean more hungry birds for me. :-) The Chickadees already come within inches of me when I'm filling or cleaning up under the feeder.
Great question! Fabulous answer!
Vicki
http://www.youtube.com/watch?v=eqg31Za9j5k
(Daughter-created video of my little hummer that stayed through the entire winter 2008: the worst winter here in decades.)