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They have a charcoal colored red fox at the park near my work. This one from the article is darker than the one here.

They are commonly referred to as a silver fox, though it's not a different species, just a melanistic red fox. It seems they used to be more common, but they fetched high value in the fur trade, so now they are much less common.

The fur of a silver fox was once considered by the natives of New England to be worth more than 40 American beaver skins. A chieftain accepting a gift of silver fox furs was seen as an act of reconciliation. The records of the Hudson's Bay Company indicate that 19–25% of fox skins traded in British Columbia in the years 1825–1850 were silver, as were 16% of those traded in Labrador. The fur was almost always sold to Russian and Chinese traders.

The silver fur of this fox was the most sought-after pelt due to its colour and style. In 1830, the allele frequency for a silver pelt was at 15% but due to overhunting, this number had fallen to 5% in 1930. The silver pelt is still hunted for and the population of foxes with this silver pelt continues to fall.