Most of mine when broody will raise up their feathers like a porcupine when I approach them. They growl and screech. Some will peck at me. Some do not. I had one that would bite and sometimes draw blood. Had to be careful with her. She was such a good mama. Would hatch any fertile egg I gave her.
They're vocal, but mainly just chirpy noises. The only time I've heard the typical "Bock Bock Bock" is when they're alarmed at something, like a snake or dog. Then they get REALLY noisy!
