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?
Vulpes qiuzhudingi: Vulpes qiuzhudingi is an extinct species of fox found in the Himalayas. Arctic fox: The Arctic fox ("Vulpes lagopus"), also known as the white fox, polar fox, or snow fox, is a small fox native to the Arctic regions of the Northern Hemisphere and common throughout the Arctic tundra biome. Arctic fox:  It has a deep thick fur which is brown in summer and white in winter.
i don't know