San Benito County, California, US
Say's Phoebe (Sayornis saya), Middle Harbor Shoreline Park, Oakland, Alameda County, California - 23 November 2013.
(Take a look at the second photo with insets of the bird in flight.)
The coloring is not right for a female western bluebird, with the red belly and the white breast (and nothing about the grey head or the back in flight looks blue). The beak size, however, looks correctly proportioned for a bluebird.
The head with crest and perch reminded me of a flycatcher, but none in my Peterson field guide look correct.
There were many swallows about, but the body shape and color doesn't look appropriate.
San Diego County, California, US