I am really interested in the genetics of these. I remember when I first read about them, I couldn't picture them in my head, and since then I seem to have seen loads of them!!! What is puzzling me is that there are some cats that at first glance obviously look like a tortie, and then I spot the tabby M on their forehead - does that automatically make them a torbie?? Is there a certain amount of colouring/stripes they have to have?