[EBB Sightings] If it wasn't a Cal Towhee, what was it?

Hiking in Joaquin Miller Park this morning, I watched a bird I first 
thought was a Cal Towhee hopping around a fallen log. All brown, check - 
but no orange under the tail and no marks at all around the face. And it 
moved more like a wren - holding its tail straight up part of the time. 
(But definitely not a wren; there was a Bewick's Wren in the same spot, 
and they weren't even cousins.)

Any ideas?

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