Thanks to Stewart's website referal, http://berkeley.edu/news/media/releases/2008/01/30_hummingbird.shtml,

I definitely found that the sound comes from our Anna's. He's been doing it, as I said, pretty steadily now for 3-4 weeks. Our house on the middle of Vashon Island in a small clearing in the woods might be a relatively poor site for him, I haven't seen a female since last summer.

Ed Swan
Vashon Island
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