This morning all of my chickens started to sing. All five would do a low toned bawk bawk bawk bawk bawk...and every once in awhile one would go bKCAW!!!! A different tone each time. All five of them. It was really loud, and did sound kind of like the egg song. We do have a 30 week old leghorn who has not layed her first egg yet. I searched for it, and couldn't find anything. Could she be going to lay her egg today? If not, what was this about?