Madison county IL.
We know when searching sparrows, the ocher/yellow face birds are pay-day.
Here a repeat look at the Nelson's Sharp-tailed:
Here your standard Swamp:
Here a Swamp with yellow on face:
Here a Savannah with plenty of yellow:
Jim Ziebol on Walker Island:
This guy proved to be a Vesper:
Here a pair that will beat a full-house.  
Take your time:
Bill Rudden
St. Louis
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The Audubon Society of Missouri's Wild Bird Discussion Forum
ASM Spring Meeting: May 1-3, 2009 in Columbia, MO.