Foxes den in rock piles or hollow logs. About five young are born in spring. Both parents care for the young and teach them how to hunt. The front track shown on left has a lot of space between the heel pad and the toes. You can tell it is a front track because the heel pad is more robust than that of the hind track.
Front tracks are larger than the hind ones.
The photo on the right shows a fox-eye view of a fox trail along the river bar. Note how the prints overlap. Each print is actually a hind print on top of a front one. The front track is on the right and the hind track is on the left in this photo. Front track is larger.