My little OEGB, Amoeba, is the most aggressive and anti-social chicken I have ever met! It does not matter if the chicken is bigger/smaller, older/younger, hen/roo, she will go after it with a vengeance. I recently bought a OEGB mix hen that came from the same place as her. That lasted a grand total of 4 days. The hen is now living with the Favorelles. Is it just her breed or what?