Please check out the video in my signature. My daughter made it on a dark, cold snowy day last winter when we'd been snowed in, here near Seattle. Worst winter in years, actually and I had a little female hummer stay the entire winter. At the time, I was struggling with some personal things and keeping that feeder thawed out for her was a god-sent diversion. She'd click at me first thing in the morning and would hang out all day. She finally flew away in early spring.....
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.)