I saw a bird I couldn't identify at Rock Creek Park, near the creek and not far from Boundary Bridge. It was a sparrow sized bird with a bright buff breast, no streaking (the color of a Carolina Wren's breast). It had a narrow black breastband just where the neck meets the breast. This band was very narrow and went all the way across the breast. It did not have a long tail.
No photo, I'm afraid. Do you have any idea what this bird might be?