Hi! I have 4 chicks and I just got them last Monday. So, I've spent a lot of time observing them and I don't quite understand this one behavior I'm seeing. One, who I'm thinking might be a cockerel, runs up to any of the other three who stretch their bodies out and flap their wings and chest butts them. The three seem to just be relishing life when they flap and, sometimes, run at the same time, but the 4th little one seems to interpret this as a challenge and runs up to face the interloper, hackles erected. The one doing the flapping just stands there and, then, the 4th one, after about 30 seconds starts to peck at the groung and all is peaceful. I have never seen any of the others run up to a sibling that does the behavior I described. It's just that one. Are they establishing a pecking order or what? Maybe it's just the equivalent of baby wolves or foxes that play fight? Any insights?