We have two leghorn hens. One white, one light brown. I've been noticing for the past few days that they will charge at each other, stop, stand as tall as they can at each other, then stop and act like nothing happened. Sitting side by side, eating together, perching together. What are they doing? Deciding their pecking order? This is our first time raising chickens, so we're not sure of their behaviors. Another question I have is about building them a nest box. I already plan to make it big, and obviously attached to the coop. But what is the best material to use?