I was out visiting my new chicks this morning - they are in a brooder on our screened porch, at the front of the house. My adult birds had been let out of their coop about an hour before and had made their way around to the front of the house, but outside the yard/fence. Suddenly my roo sent out an alarm call. As usual, all his hens froze and stayed that way. What I found interesting is that all the babies in the brooder, who don't know my roo at all, also froze. They stayed that way until my roo gave the all clear sign. Amazing little creatures, really.