The red fox mates from January through March. The female will make one or more dens right after mating. The extra dens are used if the original den is disturbed. A little less than two months after mating, the female gives birth to a litter of between one and ten kits. The male brings the female food while she is caring for the kits.
The red fox is mostly nocturnal, although it will sometimes venture out in the day. The red fox, unlike other mammals, hears low-frequency sounds very well. It can hear small animals digging underground and will frequently dig in the dirt or snow to catch prey. The fox stalks its prey, much like a cat. It gets as close as it can and then pounces and chases its prey.
Except for breeding females, the fox doesn’t usually use a den. Sometimes it will sleep in the open, wrapping its bushy tail around its nose to stay warm. When it does use a den, it will usually find an abandoned rabbit or marmot den instead of making its own den.