The gray fox even has semi-retractable claws, making it the only member of the dog family that climbs trees. Although there are 37 animals called foxes, only 12 are considered “true foxes,” meaning they're from the genus Vulpes. It's thought to be a descendant of gray foxes brought over by the people who settled the islands 13,000 years ago. DmitryND/Getty ImagesThe number of Arctic foxes is declining, and the reason may be the red fox. Red foxes are superior hunters and, to make matters worse, they also eat Arctic foxes.