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The gray fox (Urocyon cinereoargenteus) is a mammal of the order Carnivora ranging throughout most of the southern half of North America from southern Canada to northern Venezuela and Colombia. This species and the closely related Island Fox are the only living members of the genus Urocyon, which is considered to be among the most primitive of the living canids. Though it was once the most common fox in the east, human advancement allowed the red fox to become dominant. The Pacific States still have the gray fox as a dominant.