Most like a Myrtle, but note the yellow on the throat (2nd photo) and the presence of an anomalous thick short white brow instead of a linear white eye line. Sacramento Bar.
Silhouetted, yet photo well shows the big, blocky head, tiny bill, and long primary projection needed to clinch the ID for this Empidonax flycatcher.
Snipes-Pershing Ravine.
Snipes-Pershing Ravine.
Photos show 10 individuals in one flock.
Sacramento Bar.
~80% of the individuals in tis flock were Tricolored Blackbirds and most of the rest were Eurasian Starlings. One Red-winged Blackbird shows at the lower left corner.
The yellow on the black back is pollen.
Fair Oaks Park.
Third photo was totally backlit, so maximally lightened in order to demonstrate some features.
American River Parkway.