I read a lot about roosters protecting the flock from predators. In my case, it's my oldest hen that does that. She's the leader, the teacher. I have one roo that is almost fully grown and even he bows to Her Grace. He's second in command and learns quickly. I suppose if something happened to my oldest hen, he might inherit top spot in the flock and become leader. But I do believe it is purely incidental that either of them are leaders. She certainly doesn't know she's teaching anyone anything nor is she intending to protect anyone. I've read that about roosters too, that they aren't trying to teach anyone or protect anyone, its just that the others happen to heed the calls and learn the signs of danger and respond accordingly.