I am adding 3 more coops and runs to my existing coop and run. They will share a common interior fence/fences. All the runs but one are covered with net but I plan to use the one on the end for Guineas, who will free range all day and hopefully fly back into their "space" in the evening for snacks and safety. Does this sound like a large risk of something from wild birds being picked up by the Guineas and spread to the chickens?