The silver fox is a melanistic form of the red fox (Vulpes vulpes). Silver foxes display a great deal of pelt variation. Some are completely glossy black except for a white colouration on the tip of the tail, giving them a somewhat silvery appearance. Some silver foxes are bluish-grey, and some may have a cinereous colour on the sides. Historically, silver foxes were among the most valued fur-bearers, and their pelts were frequently worn by nobles in Russia, Western Europe, and China. Wild silver foxes do not naturally reproduce exclusively with members of the same coat morph and can be littermates with the common red variety, although captive populations bred for their fur and as pets are almost exclusively mated with members of the same colour. (Source: Wikipedia.org, CC BY-SA)