[animal] The silver fox (Vulpes vulpes) is a melanistic form of red fox. Silver foxes display a great deal of pelt variation: some are completely black except for a white coloration on the tip of the tail, some are bluish-grey, and some may have a cinereous color on the sides. Historically, silver foxes were among the most valued furbearers... Found on http://en.wikipedia.org/wiki/Silver_fox_(animal)
(Vulpes fulva), red fox of North America in that colour phase when the fur is black with interspersed silver-tipped hairs. See fox.[1 related articles] Found on http://www.britannica.com/eb/a-z/s/96