This is my first chickens so I'm new to this all. I've got 24 chickens. All babies. Three are the oldest. They are 8 weeks old. 2 hens and a rooster. The rooster sometimes chases them around and pecks the hens. Is that normal? Just pecking order. Or is he going to be aggressive? All 3 are mixed chickens. The mom was american game fowl. Don't know what the dad was.