I've noticed a change in the behavior of my pullets that have started laying. That's part of why I know who is laying! I don't baby my chooks. They get feed am and pm otherwise are free ranging. Im not talking about the egg song either. Once they start laying, they are the first to look up when I come around. They're always hanging around the back door. They seem to have more of a human centered focus and have more mature behaviors among the flock. My first layer has been uncharacteristicly found sharing her food with the youngest flock mates, etc. The funniest and most drastic change I've seen is in our young Buff Orpington, Blanche. She laid her first egg yesterday and her second today. She's always been very shy. The lowest in the ranks. She always moved away and would never willingly approach us. Wary when we'd throw treats and forego a treat if it meant confrontation or getting too close to us, etc.... When she came out of the coop today, she walked straight across the yard to the back door. Not another chicken in sight! She marched right up the back steps to the kitchen door and pecked on it. She just stood there when I opened the door proclaiming her song. It was so funny to see! She's like a different chicken now that she's laying. I wonder how long this will keep up.