Litters vary in size from 1 to 13 pups with an average of 5. The pups are born blind but open their eyes 9 to 14 days after birth. Pups leave the den 4 or 5 weeks after birth and are fully weaned by 8 to 10 weeks. Mother and pups remain together until the autumn after the birth. Behavior Red foxes are solitary animals and do not form packs like wolves.
Individual adults have home ranges that vary in size depending on the quality of the habitat.
During some parts of the year adjacent ranges may overlap somewhat, but parts may be regularly defended. In other words, Vulpes vulpes is at least partly territorial. Ranges are occupied by an adult male and one or two adult females with their associated young. Individuals and family groups have main earthen dens and often other emergency burrows in the home range. Dens of other animals, such as rabbits or marmots, are often taken over by foxes.