I opened the window to put in a screen and there it was lying in the gutter. I brought a chair over, so I could reach out and bring it inside. It weighed nothing. Then I took it down to the yard, laid it down on a paving stone and took a couple of pictures. My knowledge of birds is minimal, but an expert -one of the finest wildlife photographers I know - told me it looked like a Northern Parula. The poor beauty.