Eastern Song Sparrow (or Swamp Sparrow?)
I took this photograph in March, and believe that it is an Eastern Song Sparrow. It appeared very blue to me, even from 15 feet away. There's also a Swamp Sparrow that looks similar. These sparrows have the typical rust colored caps and streaked breasts, but their lighter color is white, rather than buff or tan. Technically, the Atlanta area is not a nesting area for either, but many birds (and people) decide that they like our weather!