I have two Sebastopols and was wondering if anyone could help figure out what I have. They both are close in size- the white one seems just slightly smaller. They are about 3.5 months old. They make similar noises (pretty quiet) and take turns looking out for each other. I have noticed the grey one tends to put themselves between the white one and any other critter more often but that does switch. The close up picture is the day I got them and the other ones are today.