The people on iNaturalist ided the lighter ones as grackles, too, but lets see if i can learn something about birds
So these photos were taken in northern utah, all at once—there were a few non-grackles and non-cowbirds there, a few house sparrows and a robin, and the rest were great tailed grackles, save those few brown babies
Brown-headed cowbirds tend to show up in utah during summer, which it is. Almost officially summer, and utah.gov says there ARE nonsummer cowbirds, but they’re in the southern parts of the state
Cowbirds DO look a lot like the female grackles
Theres a few of them with similar face markings, but theyre stronger on the grackles. Heres some close ups of the brown bird photos
Those face markings are pretty strong, but im more convinced by the beaks and tails?
Cowbirds have those thicker, shorter beaks and i think their tails match the grackle lengths a bit better
Theyre a little scronched up but. Probably not cowbirds, i think theyre just some feathery grackle ladies