I got 3 new chickens recently, before that I had 5 which were all pretty happy with each other and the top girl had been there for a few years, but one of the new ones is broody and very aggressive, so all the others are pretty scared of her at the moment. She has fought with my old top hen a few times and won so I am pretty sure she is now right at the top... the other 2 new ones are somewhere on the lower half I think. How common is this? It feels weird having a different chicken at the top now...