I just had to separate my two Welsummer roosters from the rest of the flock. The two brothers had formed an alliance, deposed the flock master, a very sweet natured BO and terrorized him to a point that he wouldn't come out of the coop. This morning I witnessed them both gang up on my 12+ pound Lavender Orpington, the larger of the two Welly roos starting the fight and his smaller brother joining in. The LO rooster put up a good fight, lost some feathers and eventually surrendered when the smaller rooster came at him also. Both Welly roosters have multiple scabs on their combs from recent battles.
I had two BO roosters that did this last summer and were subsequently culled from the flock when they tried to kill the Welsummer roosters.
Has anyone else ever seen this behavior in your Welsummer roosters or other roosters?