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Campylorhynchus brunneicapillus
Looking at your sculptures (on your web page), I think you'd be interested in the Animal Architecture mission at http://www.projectnoah.org/missions/8082...
It sure looks like a cactus wren... As for range, according to http://www.hcn.org/issues/40.13/manufact... and http://www.blueplanetbiomes.org/cactus_w... southern California should be within its normal range.
It's got enough spots to be a Cactus Wren, but I don't know its range well enough to say for sure. http://animaldiversity.ummz.umich.edu/si...