Drive along any back road in winter and you will flush birds up from the sides of the road where they are eating grit. Most often they are Juncos and Sparrows, but I always stop and look if I can, ever hopeful that there be something else in those mixed flocks. (I got my life Vesper Sparrow that way in Michigan.) On my last trip through the snowy countryside, I saw lots of small brown birds but as I crept up to them they would fly just a little further ahead or flush into the weeds. Finally I was able to ID White-throated, White-crowned, Song, Savannah, and Juncos picking along on both sides of the road. I truly am fond of Sparrows.