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The ancestral Arctic fox Vulpes giuzhudingi is an extinct Tibetan fox dating back to the early Pliocene (5.08-3.6 Ma). It has been described as the earliest known Arctic fox, and is linked to the modern Arctic fox Vulpes lagopus. The discovery of the ancestral Arctic fox's fossils on the Tibetan Plateau have been used as evidence for the "Out of Tibet" hypothesis. According to the "Out of Tibet" hypothesis, the Arctic fox is one of many coldly-adapted mammals that originally evolved on the Tibetan Plateau during the Pliocene.