I have numerous 3-4 week olds that are developing combs already and I have seen quite a bit of "sparring" between 3 in particular. Also one of these with a large comb already is highly agressive to me: pecks/grabs my skin and twists its head, etc. Is it safe to assume these are little cockerals? They honestly will go toe to toe and peck each other to establish leadership and they are TINY! If it helps the mother is an andalusian so they do have a type of game chicken in their breeding...so maybe sparring is normal for pullets too?