Rats 2012 Calendar. Commonly referred to as the ‘fancy rat’, these popular domesticated brown rats are the most common type of pet rat with the name deriving from the idea ‘to like’ and ‘to appreciate’. These pet rats have their origins as the targets for blood sport in 18th and 19th century Europe. Specially bred as pets since then, fancy rats come in a wide variety of colours and coat types and there exists several rat fancy groups worldwide. This Rats 2012 Calendar features stunning images to take Rat lover’s through 2012 and will make an excellent gift for those who love these domesticated rodents!