I have 2 hens that have chicks, they have been together not for 2 yrs. Got them in the same batch. Now that they have chicks they fight each other!! Like mean, drawing blood! Now one poor hen has to be locked up...... I have had chickens for a long time & my parents always had chickens & we have never seen hens do this..... What do you think the cause may be??? Do you think they will stay this way?