I've seen a few.
In fact the very first Fox I ever saw in Alberta was a Silver.
Cross Fox seem to be more common, but even they are only a small percentage of the overall Fox population from what I read.
I can't speak from experience but as I understand it Cross and Silvers occure in litters of Reds. Which makes sense to me.
I do know from experience that even Reds come a wide variety of shades of Red Yellow and Brown.
I've seen Cross Fox that were mostly dark and others that were mostly pale, and every combination in between. It looks to me like Silvers are just the extreme end of the Cross Fox spectrum.
The Silvers I have seen were mostly the classic silver, but on close examination they all had traces of the cross that gives Cross Fox their name.
The fur auctions graded silvers according to purity of color and Cross according to depth of color. A really dark Classic Cross was the top grade which the auctions grades called a Superior Cross.
I don't remember what they called the top grade Silver, but it was along those same lines, like supreme or something like that.
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