Hasan

Rather early, but Rose-breasted Grosbeak?

My impression is Less Black-backed. edit:sniped

Perfect first-winter Ringer- bicolored tail, dark primaries, bicolored bill, etc.

I'm gonna assume that Tony's right- it's a Herring.

Bill color is also often a great field mark. Notice how all the males in female-type plumage have dark bills, along with their bright eyes.

There is basically no white on the breast, the gorget shape looks fine for Anna's, and the tail looks to extend well beyond the tail. I see nothing that would suggest Costa's. Anna's can, in the right light, appear to have a purple gorget.

Agreed. Notice the structure and leg color.

It could be a domestic Rock Pigeon- there are many birds that are almost or completely white.

There is no American Goldfinch in this clip- as I stated earlier the two species we can clearly hear are House Finch and Curve-billed Thrasher. American Goldfinch is actually quite rare throughout most of Arizona. The first few notes of the House Finch song do sound a bit 'goldfinch-like', but in context it's definitely a House Finch. As to the thrasher, remember that it has a diverse set of calls and songs- you are probably familiar with the classic whistled 'whip-whip' call as it's a common sound in suburban AZ. Their songs however, are a series of (often) twice-repeated phrases. Simply based on the fact that you mentioned you're in Sierra Vista (as opposed to far outside the city) it's pretty safe to call it Curve-billed- Crissal, Bendire's, and Sage Thrasher are not really 'suburban' birds. On top of that, the quality is exactly what I'd expect from Curve-billed (lacking the huskier, more musical quality of Crissal), and Sage Thrasher or Bendire's would be exceptional for that location.

Yes, these look good for Greater with that head shape, bright white flanks, and wide black tip on the bill.

That was honestly my initial thought, but the underwings seem particularly light

That's a rather good bird, no? Outside of Arizona these guys are really hard to find

I'm not really convinced this is an accipiter. What it is, I have no clue- the apparently extremely light underwing is very confusing to me. Structurally it doesn't really strike me as one, but perhaps Ferruginous Hawk?

When used as 'why', por qué is two words and has an acento. Yep! Knowing basic Spanish can be a lifesaver if you're birding (or doing anything else) in the southwest. Considering that some of the US' greatest spots are near the border, it might be worth learning a little.

European Starling?

The only sounds I can hear clearly are Curve-billed Thrasher and House Finch. I think there might be a European Starling at the end, but really it's hard to hear.

Maybe it's just the photos, but it looks on the darker/Herring end of Nelson's, but certainly not unreasonable.

Right, but third cycle would be much more adult-like, with a grayish mantle and more whiteish underparts

Of course, pretty clearly, this is a four year gull. However, can first or second cycle Thayer's show a clearly bicolored bill? It's not something I'm used to seeing, and I did a preliminary search on eBird and could not find a comparable gull to this one.

I don't think the right bird could be a Thayer's/Herring simply due to size. I'm no expert so I don't want to jump the gun but that bicolored bill, diminutive size, and dark plumage seemingly leaves only one species, no? Curious as to others' thoughts.

No rufous/reddish on the flanks, tiny, compact structure lacking the 'long-winged' look of Broad-tailed- curious what brought you to that conclusion? Broad-tailed is very rare in the area during the winter. Looks like an immature male Costa's to me.

@Tony Leukering @Jefferson Shank It does appear to be a large falcon, but I'm curious how you ruled out Prairie here?

It's a Cooper's. It's a bit hard to judge the nape color- here the clincher is structure and shape, it is not 'bug-eyed' enough for Sharpie and notice the rounded tail.

Agreed. I don't really understand the logic of not reporting something on ebird if you found it from photos. Personal lists, however, are just that: personal.

This is not identifiable to species. Only adult male Rufous with a clearly extensive rufous back are technically identifiable to species without a tail spread.