The German researchers that showed cows can orient themselves according to magnetic fields, now have published a report that foxes also show evidence of using magnetic sensing. The scientists noticed that when hunting, foxes tend to jump in a north-eastern compass direction, with successful attacks primarily to the north. As to why foxes might use magnetic fields, Prof. Hynek Burda said:

Our favourite hypothesis is that the magneto-reception can be used as a rangefinder to measure distance.

In a totally unrelated story, a fox shot a hunter who was trying to subdue him, by pulling the trigger on the hunter's gun as the pair scuffled. No mention of whether the fox used a magnetic rangefinder for his shot.