When the first couple of hummingbirds showed up I was so happy. Now I'm refilling the feeders two and three times a day - the little devils are eating me out of housee and home. When I go out to change feeders they don't even wait until I've hung it up before they're swarming the feeder WHILE I'm still holding it. They're about 8" from my face. How can something so small be so cocky?