Are RIR natural bullies?

[Bird Fever]

I know, it's a weird question. I'm in the slow, gradual process of merging two flocks - on the one side there is the older flock consisting of a Buff Orp., RIR, and an unknown bantam breed; and the new comers are 7 week old red pyle bantams and G.L. Wyandotte. The RIR appears to be the most aggressive and sneaky about going after the little ones, my Buff is at the top of the pecking but she pretty much ignores them most of time. I remember some years ago I had another RIR bullying another Buff O but the Buff eventually turned the tables on her. Are RIR known to be more aggressive and territorial than other breeds?

 

[BlessedCountry6]

My RIR are suppose to be the worst temperament in my flock but they aren't. My barred rocks and silver laced waynedottes rule the field and pick on the newbies.