do 2 day old baby chicken roosters already behave as such ? i have a 3 week old Serama wich is definately a boy in the same cage with a bunch on 2 day old chickens but with a fence between them so they could only see each other. today i took the fence out and the Serama was imediately attacked by one of the 2 day old. and that little one wont give up attacking even though he is almost half the size. well i think i better seperate them again but is that a sure sign that this is a rooster ?