Roosters are pretty tough when it comes to defending the hens. My little 5 pound rooster I used to have fought off a hawk, and he was pretty small. And my 7.5 pound rooster saw a hawk land near the chicken coop and rushed all the hens into the barn. Then he went outside and just made himself look big and did a scary cry and the hawk was out of there. I was very proud of him. So I would say they offer a lot of protection, I don't let my hens free-range without a rooster.