Quick answer
Key facts about brown lemming — size, diet, habitat, and conservation in one place.
Population cycles
Lemming numbers peak every 3–4 years across Fennoscandia, supporting predator breeding booms. Snow tunnels let them forage under insulation through winter.
Myth busting
Lemmings migrate when food runs out and may accidentally drown crossing water — they do not deliberately leap off cliffs. The suicide myth was fabricated for entertainment.
Tundra engineering
By grazing and fertilising tundra, lemmings influence vegetation structure. Their burrows and runways aerate soil in harsh environments.
Climate sensitivity
Warmer winters with irregular snow cover may disrupt lemming cycles, affecting snowy owls and Arctic foxes that depend on lemming peaks for breeding success.