My four-month-old rooster is not acting the way I've read on here that roosters are supposed to behave. He's selfish with anything/everything that he finds to eat, and he chases the three hens away if they try to get any. Often he'll take something right out of one's mouth. Granted, the hens are not old enough to breed yet, nor are they laying eggs, but it still seems that he's big enough to act like he cares for the hens' well being. Is this normal when the hens and he are not mating? Do the roosters change once mating begins?