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. I had a "black" fox squirrel that I hand raised. He lived to be 12 years old, a full ten years longer than he would have in the wild.
This IS Zoe the "golden" zebra in Hawaii, but her colors in this photo are 'shopped. She has amelanosis. Her actual colors are more of a peachy tan color, not orange. And she isn't the only one in existence.