A tabby cat is a cat with a istinctive coat that features stripes, dots, or swirling patterns. Tabbies are often mistakenly assumed to be a breed of cat. In fact, the tabby pattern is a naturally occurring feature that may be the original coloration of the domestic cat's distant ancestors. Tabby color is found in many breeds of cat, as well as among the general 'moggy' (mixed-breed or mongrel) population. When cats are allowed to breed randomly, the coloration of the population tends toward brown mackerel tabbies with green eyes, leading geneticists to believe that this is the common wild phenotype of the domestic cat. The tabby usually has an "M" mark on its forehead.