Brown Lemmi~g Apr 2026

The ( Lemmus trimucronatus ), also known as the Canadian lemming, is a vital keystone species of the Arctic tundra. This small, stocky rodent is famous for its extreme population fluctuations—often called "cycles"—which act as a primary "engine" for the entire northern ecosystem. Physical Characteristics

Brown lemmings are among the most rapid breeders of any vertebrate:

: They produce 2–13 young per litter after a roughly 23-day gestation period. A single female can produce multiple litters per year. brown lemmi~g

: They can become sexually mature as early as 3 weeks of age.

: Brown lemmings have rounded bodies with reddish-brown backs and rumps, and grey heads and shoulders. The ( Lemmus trimucronatus ), also known as

The most notable aspect of brown lemming biology is their dramatic population peaks and crashes, typically occurring every .

: Contrary to popular belief popularized by a 1950s documentary, lemmings do not commit mass suicide by jumping off cliffs. During population spikes, they may migrate in massive groups and some perish accidentally while crossing rivers or falling, but it is not intentional. A single female can produce multiple litters per year

: They thrive in low-lying, flat meadow habitats, particularly wet areas like polygon fens that are rich in grasses, sedges, and mosses.