I am a new guinea owner. We purchased 4 from our local Buchheit. They were only a couple of weeks old, when we purchased them. I now have them in a chicken coop, where they are locked up. I also have 22 chickens. I know that I need to keep the guineas away from the chickens, until they are big enough to defend themselves. At what point can I let them out of the coop? I just want to make sure that the chickens don't scare them, where they would fly away and not come back.