• The arctic hare in the tundra of Western Siberia reaches a weight of up to 5.5 kg, which is greater than that of arctic hares in Yakutia and the Far East, where their weight does not exceed 3 kg.
• The arctic hare (Lepus timidus) has been acclimatized in South America, including Chile and Argentina.

The mountain hare is found within the Palearctic biogeographical region, inhabiting several distinct ecosystems including Celtic broadleaf forests, Sarmatian mixed forests, Scandinavian mountain birch forests and meadows, Ural mountain forests and taiga, the Scandinavian-Russian taiga, and West Siberian taiga.