My chickens are all about 10 weeks old; just acquired last week. They all came from the same run at the farm where I bought them; lots of pullets and cockerels getting along just fine. And everybody was doing fine here too. I'd been watching closely, knowing one of the cockerels would need to move to the second run eventually. But all was peaceful - until yesterday that is. I came home from errands to find the Dominique cockerel beat up and bleeding. I immediately separated him but too late; he didn't survive. I can only assume the SS roo did it. Do they often get that competitive so young? Does this indicate he'll be a "good roo" looking after his flock, that he's just aggressive, something else, or nothing at all? Well, maybe when I find some welsummer and/or Ancona pullets a cockerel will be available too. If so, you can bet he'll be in the second run from the gitgo!