I have a lovely Black Australorp hen that is in her fifth year. She has been one of my very best layers! Over the past month or so, she has begun crowing (and still lays). -not a full-blown rooster crow, but close enough that she will definitely draw attention to our flock. (We are permitted hens, legally, but no roos.) This afternoon I observed her hop atop an outdoor roost, throw her neck out, and belt out three real beauties in a row. She is definitely the most dominant hen in our flock; top in the pecking order. How common is this? Suggestions??