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.
A very unusual genetic color variation in white-tailed deer produces “melanistic” or “melanic” deer. But a “melanic” doe will rarely have spots as seen in this awesome picture, so this "may" be at the hands of photoshop.
The black squirrel is a melanistic subgroup of the eastern grey squirrel. They are common in the Midwestern United States, Ontario, Quebec, parts of the Northeastern United States, and Britain. Someone put down some nuts for him to eat.