The colors available for fur are more limited than those for feathers, though; blue and green colors in feathers aren't actually due to pigment, but to the barbs of the feathers acting as a diffraction grating. (Green is usually but not always blue from diffration + yellow pigment.) Fur just doesn't have the sort of physical structure that can produce this effect.
I suspect mammals overall more or less run the gamut of available fur colors, and to be honest there aren't many fur colors that aren't represented in natural human hair colors.
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The colors available for fur are more limited than those for feathers, though; blue and green colors in feathers aren't actually due to pigment, but to the barbs of the feathers acting as a diffraction grating. (Green is usually but not always blue from diffration + yellow pigment.) Fur just doesn't have the sort of physical structure that can produce this effect.
I suspect mammals overall more or less run the gamut of available fur colors, and to be honest there aren't many fur colors that aren't represented in natural human hair colors.