Arctic fox (Vulpes lagopus)
It inhabits the extreme north of the tundra in Eurasia and North America. It is a predator-record holder — female gives birth to the greatest number of cubs (up to 25), but the high mortality in the harsh nature leaves only 1/5 of them to reach sexual maturity. In winter, its coat becomes completely white, but in summer it is brownish-beige. During the Pleistocene, its range expanded farther south and even reached Central Europe. Then it inhabited the same habitats with the red fox (Vulpes vulpes). Today also it failed to withstand the competition and with the redfox, so it has withdrawn far north.