I, too, think they look like girls, and females WILL jockey for position (you know, the PECKING order?) confronting one another and fluffing out their neck feathers much the same as cockerels do - for a little bit. Usually no damage done, but the boss-lady emerges. If there are no roosters in the flock, that dominant female will often take on the leadership position, and will discipline the other hens, push them around, but also protect them, and even jump on their backs and appear to mate. It's really interesting to observe these social interactions. I had all girls for over a year (spent a lot of time observing all this), and then my broody hatched out a bunch of chicks, 4 of which are boys... quite a remarkable change in the dynamics of the flock right now, as they reach adolescence, believe me!