MYSTERY BIRD

Just as we were returning from walking Angus & Scout, we saw this bird fly into our neighbor's tree. I noticed it because its wings were bright blue,
so I though it must be a Scrub Jay.  It posed for me for a long time, as I took shots closer & closer.  This blip illustrates the limitations of the 
iPhone camera & the overly excited photographer.

I did some research, & think because it has a rust color underside,
with blue wings, it might be a WESTERN BLUEBIRD.  I am excited if it is.
We had Eastern Bluebirds in Michigan & they were wonderful visitors to our feeders. 

If any you are familiar with Birds of Southern California, & can 
identify it with certainty, I would be very happy.