From what I've seen it seems that whoever is the top hen has a job, and one of her duties is to keep the rest of the flock together with a running monologue of "pep talk". Our first boss hen kept up a constant grumbling, squawking, muttering, bak bak bak . . . the others would accompany her but her voice was always the loudest. When we lost her, the second-in-command stepped up to the job, and immediately took over the position of coop cryer. Then when we lost her, the next hen in the lineup took over the job. So, I'm not sure it's possible to have a group of birds and not have one loud-mouth, unless you investigate breeds that don't talk much at all . . . maybe they're out there?
But I do know that I love hearing my girls, constantly reporting on the state of the weather, the bug conditions for the day, the feed market futures, who's been laying and who's been slacking . . . you know, all the really important news! I'd much rather hear them than barking dogs, roaring motorcycles and hovering helicopters.