The foxes I photographed recently are, although fully wild and free, used to the presence of people thus allowing for great photo ops including up close and personal frames. Here is one of my favorites of those close ups, showing a bit of attitude and teeth...but in all reality it was quite a friendly fella finishing off chewing something it found in the snow (perhaps some spilled seeds or nuts that people bring to hand feed the jays). I love the cat-like pupils!
Canon 7D + 100-400L @210mm, manual exposure, evaluative metering, 1/1000s., f/7.1, ISO 800, natural light, handheld, just about FF, a few distracting oof grasses removed at right edge BG.