The silver fox is a melanistic form of red fox. Melanism is when the animal's coloring is much darker than normal. Interestingly, fox squirrels, who have brownish body fur and reddish tummy fur also have a melanistic form that resembles this.
Extremely rare – and extremely curious: Photographer captures enchanting images of silver fox in the wild
Silver fox: have been called the "king of the fur-bearing animals" due to the popularity of their pelts throughout history. The silver fox has black coloring and varying degrees of silver streaks. Its fur is so beautiful that the animal has been hunted
The Silver Fox is a melanistic form of red fox. Silver foxes display a great deal of pelt variation: some are completely black, save for the white tail tip, while others are bluish-grey, and others may have a cinereous colour on the sides.