We have never had any issues. Once they graduate from a brooder, they should be fine. We always place a block or something in the wading pool so anything can stand and get out. I have seen folks use the wading pools with slides built in so birds can walk out. Our Brown Chinese Gander was a bit territorial at first, but the tom ignored the gander. Some books will tell you to raise all species separate, but folks have raised mixed species flocks together for centuries with no major issues.