I have chickens that are 1 year old now, 1 rooster and 14 hens. During the winter, one of the hens kept sitting in the nest because the other chickens were picking on her. When spring finally arrived, and they were able to get out to roam, things seemed fine. Last week one of my chickens just died for no apparent reason. I have no idea if she was the one that was sitting in the nest.The day after that another hen was in the nest and doesn't come out. When I bring her out, the other chickens chase her and pick at her, so she just goes back to the box. She never seems to lay an egg either. Yesterday I brought her out and the other hens, but left the rooster in for a while. None of the hens bothered her at all. I let the rooster back out and the picking started again. Does anyone have a clue as to what is happening here? also, what is the chicken behavior that the rooster does, when he does this shuffling of his feet and comes at you? He sometimes tries to peck my legs too. He doesn't do it to everyone.Thanks for any info for this first time chicken owner.