well neither of my roos are aggressive, but the defiance were the one wants to crow early even after i get up and say enough (yes you can gently train a roo to stop crowing, as they do it to each other all the time), and the other one stops (my rosecomb likes to yell the: "get your welfare buts up!!!" crow, then he is done after a min maybe at most now). my new old english red, though crows later but louder, and starting to also do the sneaky crowing when my back is turned. i tried even biting him on the comb, but pinning and/or flipping him over and doing same (do till goes limp and can tussle him around a bit) was only working when he new i could quick and easily get him for it, so i got a black porous sock, and hooded him last time... now quiet as a sleeping baby! on another not, got injured by saving a bantam rooster from a huge farm rooster, and the little snot antaganised the huge dude from the safety of my arms as he tried to get back and fight at the big gentle giant old english... well trying to protect the scrappy little snot, the big guy sent a sharp spur, long and deep into the pointer finger of my right hand, right down through everything to the bone. thats smarted, and swelled like the dickens, so can now imagine what a purposeful blow could do to a vulnerable weak area/spot on purpose (or that poor stupid bantam roo who was loose after the big guy and we were trying to save, as big guy was just stomping as to defend himself, but seems could have killed the little one if wanted to.