herbert is just dominat over wilber thats why they fight, neither wants to be below the other. I personaly have 3 males in one cage, and 2 in another. it used to be 3 and 3, but smudge was causing problems(he is VERY tough, he is dominant over a bunny twice his size, he has total control of kari. he was doing this to the other boys as well but they would not take it! however you would have to do slow introductions on neutral ground. mine are generally fine because they are related, smores and patch have lived with friskit just about there who lives, as soon as they were old enugh to leave there mom they lived with friskit, spud and blizzard have lived together since birth, before birth technicly lol they are litter mates. I have never put unrealted males together but with proper intros it could work