Yesterday afternoon, we saw 2 of our hens get into a fight, they are older and we have had them for a year. One is a rir and the other a sex link. They had their neck feathers fluffed out and were chest bumping, then the rir gave the sexlink a good peck in the neck, and she went down, then some other chickens came over to investigate, and so did I. She was laying there with her head tucked under and the rir tried to peck her again, I smacked her and said leave her alone, and she tried it again, again I smacked her, and she walked away. The sexlink then got up and walked away. Checked her out and no visible injuries. Why do hens fight? Should I have intervened? Was it just a spat? Should I separate them? The only thing they were doing before the fight was trying to eat the duck food (Chick grower) my son just brought out. Oh, and btw, neither one of them is top hen, my white leghorn is top.