I have 4 guinea fowl (2 male, 2 female) and 5 chickens. (1 rooster and 4 hens). They have been together for at least two months. They have gotten along fine. No problems. However, today, the guineas have turned aggressive and mean to the chickens. They were biting and pulling out the feathers of the rooster and one of the hens. Even when I was chasing them away, they kept attacking. They free range all day and the chickens are locked in the coop at night. The guineas roost about 30 feet up in the trees and will not be penned up. What happened?!! I can't have them attacking the chickens and I'm not sure what to do with them. Thanks for any advice.