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: They average about 150 mm (5.9 inches) in length and weigh between 45 and 130 grams. Males are typically 5–10% larger than females.
: 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
The most notable aspect of brown lemming biology is their dramatic population peaks and crashes, typically occurring every . : They average about 150 mm (5
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 A single female can produce multiple litters per year
: When populations peak, they become the primary food source for many predators, including snowy owls, Arctic foxes, weasels, and even grizzly bears. In "low" years, many of these predators may fail to reproduce due to lack of food.