I have seen a few different flocks of guineas. They ARE loud. I don't know about "protecting" chickens. Depends on whether they think they are chickens too or not I guess. If they were raised from day 1 with chickens then mabye. They'll protect you and your chickens from snakes.We are getting Guineas and I have a few questions. Are they loud? Will they protect my chickens? Are they mean?