This past winter I had some incredible opportunities with red fox. Surprisingly, this pair hunted right near the road and were accommodating enough to allow for some really close photos. How close is close? I was able to capture many images using just a 70-200mm lens with 1.4x teleconverter, which is not only a very short focal length for a wild animal, but also gave great flexibility in framing.
Here are two photos of the female (vixen) that I particularly liked. I believe there are several more worthy of posting.
Image may be NSFW.
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Clik here to view.

Red Fox Portrait (click to enlarge) Full frame image with Canon 1DIV + 800/f5.6IS
Image may be NSFW.
Clik here to view.
Clik here to view.

Red Fox stalking prey (click to enlarge) - Canon 1DIV 70-200 x1.4