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A most productive mammal.
The Arctic Fox has the largest litter of all wild mammals worldwide. The average is 11 whelps. The largest litters, discovered in Russia, counted up to 22 young.
Its fur is highly insulating, being the most insulating of all mammals. It can resist temperatures of -70°C before shivering.
Its fur can change color in function with the seasons. It is dark brown in the summer and white or blue (grey) in the winter. This change allows it to camouflage and to stay warm in the winter. The blue coloration is present in all the populations with proportions being strongest in foxes living along the coast.