Do chickens get like "PMS" before they lay their first egg? Specifically, I'm wondering if that could explain one of my chicken's extreme nastiness the last few days. She's about 21/22 weeks and all of a sudden she's been picking on all the others. She will run across the yard just to peck them. Pecking hard then pushing off whoever gets near her on the roost. If one gets too close, she snaps (for lack of a better word) at her. She's also been chasing some of the others out of the coop. She used to just pick on the youngest/smallest, but now it's everyone seemingly for no reason. So could it be hormonal, or do you think this is just going to be her personality? That would be awful!