What is this little brown bird? It was sitting on the ground, eating seed, at the Deer Haven Preserve in Delaware county. It looks like a song sparrow, but it is smaller, has a much smaller bill, and a noticeably shorter tail.
The mystery bird is in the foreground- a typical song sparrow, for comparison, is in the background.
My guess, based on a quick perusal of Sibley's Guide, is a Lincoln's sparrow, but it's not quite a perfect match. What do you think?