Song Sparrows are large, dark, heavily streaked, chunky birds. The face has dark streaks through each eye and on either side of the crown, with gray between the dark streaks. Both upperparts and underparts are also streaked. The streaks on the breast often converge into a central breast spot, but many other streak-breasted sparrows can also have a central spot like this, and thus this field mark is not diagnostic. The tail is long and often held cocked up, and is pumped up and down in flight.