Description. About 100 dens cover approximately 600 km2, so it is one den for every 2.31 mi^2. The dens are used as protection for the families of foxes and often have several entrances. They have adapted to the cold to help them survive. This number is highly dependent on the lemming population in the tundra. The Arctic Fox is a small fox that is covered entirely in soft, white fur. The Arctic Fox is an important species in its environment, presented as food for many well-known animals such as the Polar Bear. If they can avoid these predators and find enough food, they may live 8 to 10 years. When the fox has finally found its prey, it pounces and punches through the snow and kills its victim. Arctic Foxes will also eat some vegetation such as berries. They measure 3 - 3.5 feet in length from head to tail. Arctic foxes are good swimmers. Today, there are about 200 individual Arctic foxes in Fennoscandia. No disrespect meant but Google is your friend. They dig their dens in rocky or sandy areas, typically on cliffs with a southern exposure. Their main enemies are wolves, polar bears and humans. Artic foxes eat a wide range of other small animals, including arctic hares, birds (and bird eggs), rodents, fish and seals. The Arctic Fox has such a high sensory system, especially in it's ears that it can locate exactly the position of its prey even under the snow. It doesn't even get cold until –70°C (-94°F). Arctic foxes will even cache food during times of abundance for use when food is in short supply. Arctic foxes use the rocky landscape, an abiotic factor in their environment, for protection against predators and the weather. The arctic fox, which lives in the northernmost areas of the hemisphere, can handle cold better than most animals on earth. Sex and Age Ratio temperatures as low as -50 degrees. Arctic fox numbers rise and fall in relation to the size of the local lemming population. Lemmings are an important prey animal for Arctic foxes. The arctic fox. Over the last century the arctic fox has had a steady decline in population due to competition from the red fox. Arctic foxes live in the planet's most extreme conditions. Size. During the summer of 2007, 24 Arctic fox litters were born in Sweden and 15 were born in Norway. They weigh between 6 - 9 pounds, with females being smaller than males. Arctic Fox Facts and Adaptations Vulpes lagopus / Alopex lagopus Arctic foxes (also sometimes called the polar fox, white fox or snow fox) are true animals of the far north, they live their whole lives above the northern tree line in the Arctic tundra.