It is prey to several animals, including the snowy owl and the Arctic fox. In this way, it led to the creation of the mutant arctic fox Alopex. It is also an occasional prey of the walrus and Arctic fox. Blue fox, a subspecies of the Arctic fox, is small. Ravens also raid the food caches of other species, such as the Arctic fox. Another example is found in the legs of an Arctic fox treading on snow. Other familiar mammals in Greenland include the Arctic hare, collared lemming, ermine and Arctic fox. It is believed that this ancient fox is the ancestor of the modern Arctic fox. The tracks of an Arctic fox were observed towards the end of April. In the northern part can be found ptarmigan, walrus and Arctic fox. The fur of the Arctic fox provides the best insulation of any mammal. Operation Arctic Fox did not meet its goals. The final version for Snow Leopard is the foundation for the "Arctic Fox" web browser. The Arctic fox also has a keen sense of smell. They are preyed on by the snowy owl, Arctic fox, Grizzly bear, and Arctic wolf.