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About arctic foxes:

The arctic fox (Alopex lagopus), also known as the white fox, polar fox or snow fox, is a small fox native to Arctic regions of the Northern Hemisphere and is common throughout the Arctic tundra biome. It is well adapted to living in cold environments. It has a deep thick fur which is brown in summer and white in winter.
The Arctic fox is a small fox with rather short legs and a long fluffy tail. Males are slightly larger than females. The Arctic fox has very thick and soft winter fur with dense underfur and long guard hairs. The species occurs in two distinct colour morphs, “blue” and “white”. Each morph also changes seasonally: “blue” moults from chocolate brown in summer to lighter brown tinged with blue sheen in winter. In winter, the “white” morph is almost pure white with a few dark hairs at the tip of the tail and along the spine, while in summer, it is brown dorsally and light grey to white on its underside. Colour morphs are determined genetically at a single locus, “white” being recessive. The “blue” morph comprises less than 1% of the population throughout most
of its continental range.
There are ten subspecies of this fox:
— A. l. lagopus (most of the range)
— A. l. semenovi (Mednyi Island, Commander Islands, Russia)
— A. l. beringensis (Bering Island, Commander Islands, Russia)
— A. l. pribilofensis (Pribilof Islands, Alaska)
— A. l. groenlandicus (Greenland Island)
— A. l. fuliginosus (Iceland Island)
— A. l. hallensis (Gull Island, Bering Sea)
— A. l. innuitus (Point Barrow, Alaska)
— A. l. spitzbergensis (Spitzbergen Island)
— A. l. ungava (Bay of Hudson Strait)

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