I have one each of Barred Rock and Cookoo Maran hens. Funny thing, when one is laying an egg the other stands in the run and makes a loud cackling until the other is done laying her egg. At first I thought it was the "egg song" and the layer was in extreme pain, but I happened to be there when it started and found the "cackler" at the gate to their run. I think it is a protective behavior, but if I open the gate the "cackler" will run out of the pen. I tried to attach a recording, but couldn't. Just curious if anyone else has experienced this behavior.