Help identifying these Bison-loving birds? (1 Viewer)

[AlB]

Found these birds atop Bison in the Lamar Valley at Yellowstone National Park, 7/13/23. Would someone please identify them? May I assume they're looking for critters in the Bison's fur?
As always, thanks for your expertise!
AlB

 

[lgonz1008]

European Starling

 

[AlB]

European Starling

Thanks. Would those with muted coloring be females?

 

[Butty]

The grey-brown ones are unsexable juveniles - except... Top right = other stuff.

 

[James Jobling]

Could the "other stuff" be a cowbird? And what about the two darker birds on the back of the buffalo; their bills don't look starling-like (perhaps just the angle)?

 

[Bewick]

Could the "other stuff" be a cowbird? And what about the two darker birds on the back of the buffalo; their bills don't look starling-like (perhaps just the angle)?

All birds in the pic are starlings.

Edit: Adult starlings have yellowish bills.

 

[njlarsen]

With only this single image I am unsure about the upper right hand bird, just like Butty. For the rest I am with the groups saying Starlings.
Niels

 

[qwerty5]

Top right bird looks blue to me. Looks like Indigo Bunting but range says otherwise

 

[nartreb]

Upper right corner bird is a starling. Bill color and shape just like the other adult starlings. Absolutely not a cowbird nor bunting.

 

[njlarsen]

Upper right corner bird is a starling. Bill color and shape just like the other adult starlings. Absolutely not a cowbird nor bunting.

I cannot see anything indicating shape of this bill. If you can, power to you.
Niels

 

[raymie]

I cannot see anything indicating shape of this bill. If you can, power to you.
Niels

It took me a bit to figure out what I was looking at, but I see the long pointy yellow bill on that bird.

 

[tconzemi]

It took me a bit to figure out what I was looking at, but I see the long pointy yellow bill on that bird.

Indeed, some stuff above the head which looks very disturbing (camera artefacts I guess), if you remove them, you have a perfect adult starling with yellow bill

 

[raymie]

Indeed, some stuff above the head which looks very disturbing (camera artefacts I guess), if you remove them, you have a perfect adult starling with yellow bill

The stuff above the head is the wing.

 

[qwerty5]

Indeed, some stuff above the head which looks very disturbing (camera artefacts I guess), if you remove them, you have a perfect adult starling with yellow bill

Yep that's a starling. For some reason it looks much more blue zoomed out.