We have 20 chickens, 19 ladies & one rooster. I've noticed that one of our red sex links is mercilessly picking on one of our EE's, chasing her and chasing her and mounting her when she catches her. This only happens out of the view of the rooster. The red sex link seems to be causing all the issues, but some of the other hens are now picking on the EE as well. Our rooster is always mating with the ladies and mates with the RSL (who is causing all the issues) quite frequently. The EE is currently hiding in the coop, up in the roosts. We always have had a rooster in our flocks and I don't ever remember seeing hens mounting hens. I've only heard about it when there is no rooster present. And our RSL girl is definitely a girl. I've always thought mounting was a dominance thing, so is she just asserting her place in the pecking order? Any ideas?