I'm new to raising chickens. I bought 20 hens and two roosters, (I thought I would lose some) I've had good luck and sold some, I now have 14 hens and 1 rooster, all buffs. They are almost 5 mo old and all of a sudden the rooster is crazy! He chases the girls, try's to mount them, and keeps them "gathered up". My hens are hiding in the corners, won't come to me and try to hide from the rooster. Is this normal? Tonight I locked the rooster out in the run and the hens in the coop to give them some peace.