I was wondering...leading up to a rooster mating, what kinds of behavior should I notice? My roo is 6+ months old, just started crowing this week. I've noticed some extra aggressive behavior from him. Couple times, on a couple different hens, he would come up from the side and grab a hold of feathers, pretty nasty like, behind their heads. I've seen a few feathers fly. However, no jumping up on them. Is this a pre-mating behavior I'm seeing? We check our eggs, and none have been fertilized yet.