AlexHenry

Also note the very narrow nail on the bill in the head on shot.

This bird, especially in the 4th photo, appears to have an almost nonexistent neck. Also the underwing coverts look pretty solid brown without a trace of the silvery that Sooty Shearwaters have. This doesn't look like a Sooty Shearwater to me. As @akandula mentions, the compact, short necked shape reminds me more of a petrel or fulmar than a shearwater. But I don't have much experience with Short-tailed Shearwaters and none with Murphy's Petrel, so I don't think I'm qualified to say any more.

Notice the contrast between the head/neck and breast, the gray rather than white inner secondary (visible below those 3 black tertials)... I would not be comfortable calling this a Eurasian Wigeon, but I struggle with this ID frequently myself. It certainly does stick out among those female American Wigeons, but keep in mind that female American Wigeons are quite variable, and that hybridization between these species is fairly common. Summary: I don't think its Eurasian. Likely American Wigeon, possibly hybrid.

No I don't think so.

A Raven about to start bothering a Golden... Nice rufuous-y intermediate Ferruginous Hawk.

This is a tough photo, I'm not sure if Red-tailed Hawk can be ruled out. In this perched position the wings seem pretty long, which leads me to think Harris's Hawk can perhaps be ruled out as a possibility.

Golden Eagles have a significantly longer tail than Bald Eagle or Turkey Vulture. They also have more bulging secondaries than Bald Eagles - especially the juveniles, which have longer secondaries than adults. Coupled with a smaller head and bill than Bald Eagle, but larger than Turkey Vulture, and the tendency to soar with a slight dihedral, very steady flight (vs Turkey Vulture), and slow, lazy circling (vs Red-tailed or even Ferruginous Hawk) all lend Golden Eagles a rather distinctive look and feel, even from great distances.

Yellow-bellied Sapsuckers are rare in CA, but do occur regularly enough that any sapsucker in CA should be treated with care. Especially in fall and winter, Red-breasted, Red-naped, and Yellow-bellied Sapsuckers AND hybrids are all possible.

Black Scoter (they are pretty uncommon in SF Bay, always present in winter but in very small numbers mixed among thousands of Surf Scoters)

How do you get so many birds in your yard? Yard list 111 ?!? I don't think mine is even 30... (I am assuming this Siskin was in your yard?)

The bird on the far right has a rather blocky head and stout bill, I think of Thayer's as being much more gracile than this.

Lots of Herring, a few Ring-billed Gulls. As you mention, there are a couple Lesser Black-backed Gulls in there, and a young Great Black-backed Gull in the 4th photo. The bird visible with its head tucked in the 5th and 8th photos, and in the middle of the (cropped) 7th photo, appears to me to be a Glaucous Gull due to its overall paleness and it seems larger than nearby Herring Gulls. Nothing else is sticking out to me as different.

If you are close to Joshua Tree NP you should go and hike around Jumbo Rocks Campground in the early morning or evening, good for Le Conte's Thrashers and Great Horned Owls, Ravens. Le Conte's Thrasher breeding season peaks in March and April so they should be active around then.

Dark morph Ferrug: PAGP Thayer's