I volunteered at a rescue outfit before I moved, and we had all kinds of birds together. I think it works the best if there's a large mixture, the genders are divided, and the bully birds don't outnumber the gentle birds. I've seen everything together except swans. Some pheasant breeds are rougher than others like I mentioned earlier, but they did okay with a large mixed-flock. There were chickens, turkeys, and guineas to balance it out. I don't think I'd trust pheasants with quails though. With any mixed-flock you have to watch and wait to see how they do before you can trust they'll be safe together.