Thank you, Mark. I also got 7 offline replies, and the consensus is 
Swamp Sparrow. I had no idea they were so colorful.

I think it would be useful to other sparrow novices like me to post 
the most complete response I got, which was from Kurt Schwarz:

"Looks like a young Swamp Sparrow. Note rufous in wings, gray
collar, gray breast with faint streaking, beginning to coalesce into
a central spot, white throat patch."

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June Tveekrem
Columbia, Howard Co, MD
tweekiebird AT toadmail DOT com


Mark Hoffman wrote:
> June - it's a Swamp Sparrow.