As far as the most common (not only at feeders) I would say the Common Grackle in the east and the Brewer's Blackbird in the west.

Hey Gold-digger. Interesting thought but native means naturally occurring within their range. Also not all species migrate, at least not far. I have several resident Anna's Hummingbirds that stay around all year as long as I keep their feeders full and it doesn't get too cold. I have been to Ramsey Canyon and other birding areas in Arizona and New Mexico. Great place to visit in the spring and early summer. Added more than 50 bird species to my life list.
Cheers!

Hey Steve, Ranger is right. There are many native species of sparrow. In my area I have Golden-crowned, White-crowned, Fox and some migrants. The non-native is the English Sparrow AKA Weaver Finch.

My most common bird species at my feeders are Dark-eyed Juncos. Second is the California Quail.
My favorite is the Spotted Towhee (see photo).

Hey Steve, nice catch! What did you catch them on.

OK good luck and tight lines always!

PM me when you're heading up. Might be able to meet up with you and share some of my fly techniques with you.

Very nice limit!!! What did you catch them on. I will probably head up there next month to fly fish.
Tight lines!!!

Thanks Steve. Hey have you ever tried top water lures when fishing the Napa?
When I lived in the Bay Area and fished the sloughs for striper I usually used Cordell Spots or Bill Lewis Rattle Traps, but on occasions when there was significant surface disturbance I would switch to poppers and walkers like the Zara Spook. I imagine that spinner baits and buzz bait would also work well.
Tight lines!

Good thought and yes I always have some of both so I can match what the fish want on a certain day.
Tight lines!

Those are great!!!
I guess the last photo is an Amish fishing rig.

Here's another tip to increase your strikes and hook ups. I discovered many years ago that my spinners that had a feather or fur dressing attracted more strikes than the same lure with just bare hooks. I began to experiment with my spinners by clipping off the bare treble hooks and adding a split ring or wire snap so I could change to a dressed hook of my choice or a straight-eyed streamer fly. (Straight-eyes ride better behind a spinner than a down or up turned eye). Again this improved my catch rate.
A flashy tail can attract more bites as proven by professional anglers who add them to their jerk baits and other lures (see the Rapala X-Rap on the lower left of photo). Also many bass lures such as spinner baits, buzz baits and jigs come with plastic or rubber skirts for increased action. They are also effective in salt water applications as shown by the lures along the lower part of the photo.
Some in-line spinners come dressed from the factory or you can purchase them from vendors such as Bass Pro/Cabelas or tie your own. If you want to make your own, you will need a fly tying vise or some tool to securely hold your hooks while you attach your materials. You can purchase used vises on Ebay for about 20 bucks more or less. You will also need some tying thread that comes in many colors. You can find tutorials on fly tying on YouTube and Pinterest. I mostly use buck tail, squirrel tail, rooster hackle and marabou. Also I add synthetic materials such as holo-tinsel and crystal flash for more attraction. These materials reflect light in a very attractive manner and simulate the shiny sides and scales of many bait fish. You can purchase these materials from many fly shops or from other fishing retailers such as Bass Pro/Cabelas. If you are a hunter, you can save materials from the game that you harvest.
Give it a try and see what happens. It will also fill some off-season time or when the weather is too cold or wet for fishing.

Very interesting! The eyes work on dead bait as well as on moving lures. Thanks for you post and best of luck in your fishing adventures!!!

Hey DC I couldn't find the swimbait eyes that I mentioned. I think they were advertised in Bass Pro or Cabelas but I could not find them after searching through my collection of catalogs. I did a search with them and EBAY but they have probably gone out of business since many manufacturers have started molding them into their baits.
Tight lines and more hook-ups, Mike