A small rodent endemic to arctic and subarctic tundra regions of Scandinavia, characterized by cyclical population explosions and remarkable migratory behavior.
Alpine and arctic tundra environments across Norway, Sweden, and Finland, typically inhabiting mountain heaths, moss-lichen landscapes, and high-altitude regions between 500-1500 meters elevation
Critical keystone species in arctic ecosystems, serving as primary prey for predators like arctic foxes, snowy owls, and providing crucial ecosystem population regulation and nutrient cycling
