Could this be a female tri-colored blackbird (1 Viewer)

That's the nearest match I can come up with in my field guide, but the bill color doesn't look as dark in the book. The bird was in the overgrown area above the ruins of the Sutro Baths at the ocean shore near Cliff House in San Francisco, CA. Tri-coloreds are known to be in the area, but they are supposedly gregarious, especially in breeding season, and though I saw a few redwings and lots of Brewers', I saw no other birds that looked like tri-coloreds.

Thing is, in the Bay Area, the Redwings are the "bicolored" race and the females of that race just happen to closely resemble female tricolors.

Yeah, but the bi-colored female is streaky all over her belly, at least according to Peterson's. The ones I've seen were not so clearly streaky as the illustration in my Peterson's, but not as monochrome dark brown as this bird either. I've read that there are tri-coloreds, unusually for No-Cal, at Sutro Heights - just a block away from where I saw this bird. Not that I saw any while I was there just an hour before