Urocyon

Urocyon (Greek: "tailed dog") is a genus of Canidae which includes the gray fox (Urocyon cinereoargenteus) and the island fox (Urocyon littoralis). These two fox species are found in the Western Hemisphere. Whole genome sequencing indicates that, among living canids, Urocyon is sister to the remaining genera. Fossils of what is believed to be the ancestor of the gray fox, Urocyon progressus, have been found in Kansas and date to the Upper Pliocene, with some undescribed specimens dating even older.