I hear ya. My first batch of 8 never did really make much noise. Then last year, I bought 6 more for new blood. One lil girl in there screeched from day one, all the time. Day and night. She still screeches but the last few days she has lost her voice. I had visions that in the night the other guineas took their lil wings and strangled her voice box.
She does annoy even the others. I will see her carrying on for nothing and then one of the othen hens will get fed up with her noise and boink her on the head with their beak.
I never have heard of a guinea losing their voice before so you can imagine. Its kinda funny, all she can muster now is a faint b'geep.
I enjoy them for the most part, just this one. I told her if she lived ANYWHERE else she would have been dinner a long time ago. Even folks with guineas comment on her. She has recently stopped screeching all night tho. thank goodness.
They have managed my chigger population tho. That is wonderful. My chickens dont eat the chiggers at all. Once they got the ticks under control they started after the chiggers. What a relief, I tell ya. I was wondering how they did it, as i know chiggers arent really big enuff to see. Well one day I was watching them, and as they got hungry and there were less and less bugs in the yard, they would take a long leaf of grass and run their beaks all the down from the root to the end of the grass stalk. They didnt eat the grass, just slide their beaks along the blade like someone eatin corn off a cob. I dont know if all guineas have or know this trick but mine sure do and I love them for it. I imagine its a learned behavior, but it has really got the chiggers under control in my yard. Have to love it.