I have 4 chickens: 3 mystery breed pullets and 1 standard light brahma cockerel. He gets along with two of the pullets with no problems, but he bullies the smallest one, she is most likely a bantam mix and about a week or so younger than the rest. I'm pretty sure she is a pullet because she has no comb or wattles, and hasn't grown any shiny tail feathers or hackle feathers at all. However, my cockerel seems to really dislike her, because he circles her, looks like he's gonna charge her with one shoulder, pecks at her and tries to make her leave the coop at night, and also if she happens to be close to him when they are eating, he scares her away. I'm confused as to why he acts like that, because other times during the day they all hang out together, and he has never drawn blood or pulled her feathers. He also doesn't act like this with the other two pullets who fight back and make him run away if he gets too rough. I don't know if it i because he is already like 5 times bigger than my pullet, or if he thinks she is a rooster, but is there any hope the behavior will change once they start laying eggs?