Brown lemmings are among the most rapid breeders of any vertebrate:
: The crash is often driven by a combination of over-foraging (depleting their own food supply), intense predation, and weather conditions that affect snow quality. Reproduction
: Brown lemmings do not hibernate . They spend winters in "subnivean" environments—insulated tunnel systems beneath deep snow that protect them from extreme cold and avian predators. brown lemmi~g
: They thrive in low-lying, flat meadow habitats, particularly wet areas like polygon fens that are rich in grasses, sedges, and mosses.
: 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. Brown lemmings are among the most rapid breeders
: They possess small ears and short tails hidden in thick fur to conserve heat. Unlike some other species, their coat does not change to white in winter, though it may grow longer and greyer.
: They can become sexually mature as early as 3 weeks of age. : They thrive in low-lying, flat meadow habitats,
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