The silver fox is actually just a black variant of the red fox. Back in the day, their pelts were the most highly sought after by nobles in Russia, Western Europe and China. They get the nickname of silver fox because of all the white at the tips of their hair follicles. This particular silver fox was foraging amongst the alpine wildflowers late one rainy afternoon on Mount Rainer in Washington.
Nikon D300 with Nikkor 200-400mm lens (at 400mm) ISO 800, f/5.6 at 1/320th of a second