I have been surfin' some Japanese rat blogs. From what I can make out most pet rats in Japan are either husky or hooded. There are also some white rats, and more solid colours too, but they seem less common. Bill and Boris who live here are almost one colour all over - with only a splash of white on their chests. Bill is especially unusual since he has funny dumbo ears and also rex fur. Mummy and Colin are, however, huskies (or roan, as it seems to be called in the US and UK these days). As you can see from the picture I don't like to be defined by silly human definitions and am confusing them by being both hooded and husky.