It was pointed out to me that the size difference between Rock and Cactus is considerable and should be obvious especially if they were seen together. The bird I saw was only slightly larger than the Rock Wrens nearby. Also, the length of the tail beyond the primary extension seems to be shorter in the Rock than the Cactus. Comparing my photo to ones on the web it seems more consistent with Rock Wren. I guess i will chalk it up as an aberrantly plumaged Rock Wren.
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