Question: Worker: Which animal which is white in winter and brown in summer lives throughout the Arctic and can trace its roots to an extinct animal that lived in the Himalayas?
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