I have now positively identified the yellow-headed bird in the backyard as a Townsend's warbler. There's also a black phoebe across the way, but I have been seeing more of those recently. A rare treat was the black oystercatchers along the Playa del Rey breakwater. Keeping the warbler company are also a bunch of enthusiastic bushtits/nuthatches/chickadees/titmice, but I haven't gotten a clear look at them! They are tiny and move fast.
Besides the omnipresent in-city English sparrows, pests starlings, flying rats pigeons, mockingbirds, Ana's hummingbirds, mourning doves, scrub jays, Western gulls, California gulls, herring gulls, American crows, and slightly less often-seen but not rare house/purple finches, Brewer's blackbirds, red-tailed hawks, turkey vultures, ravens, and oh yes parrots, I have also spotted roadrunners (when on road trips, heh), an osprey or two, red-winged blackbirds, rocks, American kestrels (male and female, likely a mated pair), ring-necked doves, prairie falcons, willets, sanderlings, long-billed curlews, marbled godwits, black turnstones, killdeers, avocet, and a bunch of others I'm too lazy to remember or list at the moment.
The Townsend's and oystercatchers were a treat though. There was also a snowy egret and a milieu of terns, sanderlings, willets and turnstones, but no blue herons.