arctic foxes

The Arctic Fox (Alopex lagopus or Vulpes lagopus) is a small fox native to cold Arctic regions of the Northern Hemisphere. It is common to see an arctic fox in all three tundra biomes. Although some authorities have suggested placing them in the genus Vulpes, they have long been considered the sole member of the genus Alopex. Smaller, more rounded ears than red fox; braincase more rounded and muzzle slightly shorter and broader than Vulpes vulpes (Clutton-Brock et al. 1976).
Occurs in two distinct colour morphs, "blue" and "white". Each colour phase also changes seasonally "blue" moults from chocolate brown in summer to lighter brown tinged with blue sheen in winter. In winter, "white" is almost pure white, while in summer it is grey to brownish-grey dorsally, and light grey to white below. Colour morphs are determined genetically at a single locus, white being recessive. The "blue" morph comprises less than 1% of the population through most of its continental range, but this proportion increases westwards in Alaska, and on islands.
Head-and-body length: 55 cm (male); 53 cm (female). Tail length: 31 cm (male); 3O cm (female). Shoulder height: 25-30 cm. Weight: 3.8 kg (male); 3.1 kg (female).

Taken from Wikipedia.

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