I have a black australorp that is mounting other chickens. It looks identical to my other black that I know is laying and it hasnt crow'd or anything. The only thing that makes me think its a roo is the mounting. Twice now I have had 10 egg days (I have 10 chickens). How common is it to lay 2 eggs in one day? Or could my girl just like other girls?
I have an old BA hen that does the same thing to every bird under her in the pecking order. It's pretty normal behavior.