Question: Vulpes qiuzhudingi is believed to be the ancestor of which small fox native to the Northern Hemisphere?
Sentence (from "Vulpes qiuzhudingi"): The species is believed to be the ancestor of "Vulpes lagopus", the modern Arctic fox, which would support the "Out of Tibet" theory: namely, that a number of current arctic species trace their ancestry to species originally from the Tibetan Plateau.
Relevant evidence: Yes