[Lesser Black-backed gull?]

@Jim HighbergerSuperb photos!      I agree with Lesser Black-backed for the subject bird.

[COMMON TERN?]

I'm leaning Common over Forster's. It looks to have a darker grey upperwing, a dark wedge on the primaries and I think I can see dark outer webs on the tail. Wait for more experienced input.

[Hilton Head Mysterious Songbird]

Definitely a juvenile with that fleshy gape.

[Is this a Least Sandpiper?]

I think White-Rumpish.

[Oriole, Baltimore or Orchard?]

I can't find any images of a Bailtimore Oriole with that chestnut color, so, it may be an Orchard. We'll both wait for the experts to figure it out.

[Oriole, Baltimore or Orchard?]

I see what you mean about the general color but the male Orchard Oriole should have a black tail so my vote is for Baltimore.

[Please Help Me Identify This Migrant]

Agree with lonestranger- female Western Tanager-

[ID help please]

Agree with hbvol50. First bird a female Blue Grosbeak. I like Forster's Tern for bird #2. Common Tern would have a more reddish bill and dark outer webs on the tail. I am not an expert.

[Unknown bird - id help please]

I also meant Cowbird. Thanks for correcting.

[Unknown bird - id help please]

Welcome to WhatBird. My best guess is a Brown-headed Blackbird, but wait for the experts, they'll nail it down for you.

[Female Oriole?]

Could be a female Orchard Oriole.

[Solitary Sandpiper Confirm]

confirmed

[Bird feathers Toronto]

Red-tailed Hawk. A good reference guide can be found at "THE FEATHER ATLAS"

[Northern Shoveler?]

I like the ID by Peromyscus. Mallards. They do seem to have large bills.

[Spruce Grouse?]

Looks like a Dusty Grouse chick and its mom.

[Northern Shoveler?]

Leaning towards Green-winged Teal. I'm not an expert.

[Confirm Tennessee Warbler?]

Halifax, Nova Scotia today. Tennessee Warbler would be a first for me so, can you guys confirm? Thanks.

[California Gull?]

Looks good for a California Gull to me. My points of reference are--- black and red spots near the tip of the bill, dusky brownish-yellow eye, what looks like dark gray wings and the obvious down-turned gape. I'm only going by my reference guides so wait for a more experienced birder.

[Small dark gray bird with black cap/crown in northern NJ]

Maybe juvenile Dark-eyed Junco?

[Female House Finch?]

Agree with House Finch with the generally blurrier streaking. A good ID trait for finches and sparrows vs. thrush is the conical bill.

[Is this a Savannah?]

Looks good to me.

[Please and thank you]

I agree with Willow and great picture.

[New songbird in South Idaho]

You could try a House Finch or Cassin's Finch.

[Whose nest?]

Gray Catbirds are known to construct their nests near or on the ground and their eggs are blue-green and glossy.

[What Duck]

I agree with Birding Boy. Northern Pintail.