Island gray foxes are thought to have arrived on three of the six California Channel Islands they now inhabit some 16,000 years ago, either by swimming or by rafting on floating debris. Humans, who first colonized the islands about 6,000 or so years after the foxes arrived, took them to three other islands. Learn more about the Urocyon littoralis, more commonly known as an Island Gray Fox, in this easy-to-read species overview by the Smithsonian's National Museum of Natural History.