PascalNJ

Red-tailed Hawk. You can actually see the red tail. Plus belly band. Cooper's and Sharp Shinned have long tails and short wings.

To me, the absence of dark patagial marks is already a strong indication. Then markings that are more concentrated on the chest, which doesn't give the belly band / clean chest look often (not always) seen on RT, strong tail bands, not the sort of thin, dilute banding of RT, and the light crescents at the tip of the wings, clearly seen on the second picture, all this points to a red-shouldered, not a red-tailed.

I think the bill is too small for a Crested caracara. Looks more like an immature Yellow-headed caracara, with a striped tail. Just my personal hunch ...

I don't think any of these birds is North American. The first one is a Seriema. They are the last surviving relatives of the extinct Terror Birds.

How about a Nuthatch then. Based only on the second picture.

Least. Yellow bill and white forehead.

Spotted whistling duck?

These are Guans, I think. Maybe Blue-throated piping guan, but I'm not sure of the species. South American birds, I have seen related species in Brazil.

Depending on where in Alaska, they have been reported in the south part. But rare, obviously.

How about a Catbird for the first one?

I'm certainly not the most knowledgeable with sandpipers, but isn't the bill too long and the eyebrow too large and in contrast with the rest of the head to be a Semipalmated Sandpiper?

Both Red-winged Blackbirds

Field sparrow. Pink bill, gray face with rusty cap and eyeline/cheek.

Yes, Black & White undertail

Female Blue Grosbeak, with this huge bill. The color on this picture seems about right.

Common yellowthroat

Black and White Warbler

Undertail coverts are too red and contrasting with the tail feathers to only be a shadow. At least, that's my opinion ?

Scarlet, I think. A Summer would have a red tail.

Yes, I wasn't sure about the actual eye color (hence "This could be..."). The picture is underexposed and makes it difficult to clearly determine eye color.

This could even be a Boat-Tailed, due to dark eye and very long tail. Depends on where in Nthn NJ this is.

Wilson's Plover with this big bill.

I agree. https://www.allaboutbirds.org/guide/Turkey_Vulture/species-compare/70706101 Ospreys have dark wing tips, not white.

Yes, I agree. It even has the black line above the eye breeding males show. I don't think Black-tailed are seen in Colorado.

Melodious Blackbird I think. Look at the bill.