Winter coat.
Summer coat.
The polar ravene, Vulpemys albulus, is a foxlike predator rat that lives in the tundra of the Northern Hemisphere. It is the principal predator of the meaching.
It is about the size of the extinct fox and very different from its temperate woodland cousin, the temperate ravene. The latter measures about 3¾ feet (114 centimeters) in overall length, 11¾ inches (30 centimeters) high at the shoulder, and weighs 10 pounds (4.5 kilograms). The polar ravene is 3⅓ feet (112 centimeters) long, 14½ inches (37 centimeters) high at the shoulder, and weighs 14 pounds (6.4 kilograms).
It has a small head with tiny eyes and ears (an adaptation that prevents frostbite) and long, dull brown fur that turns white in the winter to camouflage it against the snow. It attacks the meachings by digging into the fortress with its front paws.
In early autumn the polar ravene molts its dull summer coat and grows a thicker creamy brown covering of fur.
Polar ravene face.
Temperate ravene face.
Although the polar ravene is larger than the ravene of the temperate woodlands, it has smaller facial features.