Fur animals of which natural zone have thicker fur: tundra or steppe, European taiga or Siberian?

The colder the winter, the thicker (and therefore more valuable) animal fur. The most valuable fur is in animals of a sharply continental habitat (sable). Winter is milder on the Russian Plain. The fur of the Arctic fox, a resident of the tundra, is more valuable than the fur of the marmot, an inhabitant of a territory with a warmer climate.

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