The fox can survive in different areas, varying from intensely cultivated lowlands to forests and highland pastures up to and over 2500 m.
Its coat is usually dark brown-red on the upper body, and whitish on the lower body and the tip of the tail, while its ears are black; it changes colours frequently according to the season and its environment. It is about 70-90 cm long, with 35-40 cm for its tail, while its height at the wither is 30-40 cm; its weight varies from 4 to 11 kg. It is an "opportunist" predator and its diet can include: main food sources such as hares and small rodents; occasional food sources such as reptiles, amphibians, fish and any type of edible refuse.
Studies on the diet of the fox in the park have shown that it even eats chamois and ibex in summer and late winter, which confirms the opportunistic role of the species. In these periods the fox preys on young goats abandoned by their mothers, or those who died during birth, and it feeds on animals that have died of hunger. The species is distributed widely all over the park.