At least I think it's a sparrow. Maybe a juvenile something? Taken this morning in a local grassland preserve. There were numerous Grasshopper Sparrows around, but this seemed larger and darker. There were also plenty of Song Sparrows, and I have seen Savannah's there, although not (to my knowledge) this morning. This bird has yellow supralorals, a blackish cap with thin white medial crown stripe. Generally scruffy, with no clear streaking, just blotchiness on breast. Hint of yellow on the shoulder. In a few frames there is a hint of malar marking that might some day become a Savannah facial feature, but not clear. Bill seems chunky, with curved culmen; maybe too thick for Savannah? Doesn't look right for White-throated, and I think they've left here for the season. I don't believe it's a young RWBL, or Dickcissal, or Grosbeak, or Finch. I'll post a second frame, larger crop, after this one. Any thoughts?