Everyone will tell you something different , but for me, I raise my with the chicks, but as adults most won't even go in the chicken house,(though some do lay in there) they prefer to roost outside They freerange my property. Once in a while one will make a run at a chicken, but they have never hurt none of them or even grabbed one. If you are planning on keeping them locked up with the chickens it might be a different story, maybe someone who has tried it, can tell you something different.Ok, I just read the guineas will know my chickens off their roost at night.... is that true?