On Tue, 9 Feb 2010 13:59:44 -0800 (PST), you wrote:

>Hi Tweets,
>
>I am hoping someone might have an explanation for me..
>
>I have a home office and hanging right outside my window are three bird feeders.? They are 4-5 feet from where I sit?and have been there for about a year and a half now.?
>
>There are flocks of both chestnut backed and black capped chickadees that feed on the sunflower seeds and the suet.? There are Juncos, Towhees, Nuthatches?the occasional House Finch and a few Song Sparrows.? About a week ago, I noticed a song sparrow hopping around in a bush in kind of a circular fashion and he was fluttering his wings.? I looked up in the Bird Behavior?handbook and identified this as male courting?behavior.? Seems a bit early but it has been warm...? There was a female perched on a branch of my apple tree close by watching attentitively.
...

Hi Paul,
I had a neighbor last year that called me to come over and watch a
bird (which turned out to be a Song Sparrow) attacking her windows on
and on all day long. He would fly at the window and then go up in a
nearby tree and sing like crazy and then go at the window again.

At my suggestion she closed the blinds and also put newspaper up on
the windows, but he would just move to another window on the house and
repeat the behavior. He obviously was trying to drive his equally
aggressive reflection out of the area.

This was in April and he continued to attack the windows for over a
month before either finding a mate and settling down or giving up.
I've heard song sparrows singing regularly for the last couple of
weeks or so. Maybe the warmer weather makes them think that winter
(what we had of one) is near an end and spring is here.

Craig Kerns
Lake Forest Park, WA
www.troublebound.smugmug.com