Arctic fox
Arctic foxes live in some of the planet's most
extreme conditions. An arsenal of cold-conquering adaptations helps
them survive temperatures that plummet below -50 degrees Celsius. These
include the animal kingdom's best insulating fur and increased blood
circulation to the feet which stops the fox's paws freezing to the ice.
They range far and wide in the arctic and alpine tundra, but home dens
are important and may be used for centuries by subsequent generations.
Lemmings are such an important part of their diet that arctic fox
populations can be greatly affected by their availability.
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