Do male rats take an active roll with there babies? My male is not the father of my new female's babies, but he has become really protective f her. He has been making a nest for her and refuses to leave her side. I was just wondering if it was normal for him to act this way. After the birth there is no danger of her getting pregnant right after Because he is sterile, so if its safe i would like to just leave them together. She seams happier with him there.