So I have three 6 month old hens and have two 6 week old silkies now. I have not integrated them yet as even when I just put the silkies outside in their cage, the other hens tried attacking them... I'm scared to let them roam around the yard all together. Is this a legitimate concern or should I get over it. They wouldn't seriously kill or hurt them, would they? Any thoughts of how I can start bringing them together?