Yup yup.... As for the lady at the petstore and the size of his head, that should be added to the list of bs stuff we hear at pet stores. My boy is about the same size as yours <a year younger though> and he eats a nice fat juicy small rat once a week. I need a new scale though, my girl has turned into a pig so wondering about the exact weight of these adult mice, no way she could take down a rat yet and I don't have access to weanlings.