I've been consulting all the bird books and online identification guides I can get my hand on and have still not come to a definitive identification. I have considered the possibility that a swamp sparrow strayed a little from the wetlands and landed in my yard to snack for a few days.
I have also considered that it may be a Lincoln's sparrow on its way north to nest. But I can't absolutely convince myself one way or another. The Sibley bird guide does say that they're closely related, so perhaps my inability to decide isn't without cause.
Any birding experts or enthusiasts out there that can help me pin a name on this little cutie? It's a small bird - I'd say in the 5-6 inch range.