I have about a dozen Buff Orpingtons and 3 Parakeets ...2 males and 1 female. I was thinking of putting the parakeets in the run during the summer to enjoy the great outdoors. The run is 8' x 24'. I would suspect the parakeets would perch up high as is their nature but would they dive at the chickens. I don't think the chickens would really care, they're pretty easy going.