I just got a new hen last night (age un known) I put her in the isolation pen gave her food and water made sure everything was Secure and went to go make dinner. While cutting vegetables I looked out the window and saw "Roo" my cockerel hightailing it across the yard to the isolation pen. I walked outside in time to see him break into the coop Corner her and force himself on her... Roo is only 7 months old. Is this normal??