Norwegian lemming, Norway lemming, Norwegian lemming
The Norway lemming, also known as the Norwegian lemming (Lemmus lemmus ) is a common species of lemming found in northern Fennoscandia, where it is the only vertebrate species endemic to the region. The Norway lemming dwells in tundra and fells, and prefers to live near water. Adults feed primarily on sedges, grasses and moss. They are active at both day and night, alternating naps with periods of activity.
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DiurnalDiurnal animals are active during the daytime, with a period of sleeping or other inactivity at night. The timing of activity by an animal depends ...
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NocturnalNocturnality is an animal behavior characterized by being active during the night and sleeping during the day. The common adjective is "nocturnal",...
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HerbivoreA herbivore is an animal anatomically and physiologically adapted to eating plant material, for example, foliage, for the main component of its die...
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FolivoreIn zoology, a folivore is a herbivore that specializes in eating leaves. Mature leaves contain a high proportion of hard-to-digest cellulose, less ...
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LignivoreTe
TerrestrialTerrestrial animals are animals that live predominantly or entirely on land (e.g., cats, ants, snails), as compared with aquatic animals, which liv...
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AltricialAltricial animals are those species whose newly hatched or born young are relatively immobile. They lack hair or down, are not able to obtain food ...
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ZoochoryZoochory animals are those that can disperse plant seeds in several ways. Seeds can be transported on the outside of vertebrate animals (mostly mam...
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TerritorialA territory is a sociographical area that which an animal consistently defends against the conspecific competition (or, occasionally, against anima...
Among animals, viviparity is the development of the embryo inside the body of the parent. The term 'viviparity' and its adjective form 'viviparous'...
A burrow is a hole or tunnel excavated into the ground by an animal to create a space suitable for habitation, temporary refuge, or as a byproduct ...
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Generally solitaryGenerally solitary animals are those animals that spend their time separately but will gather at foraging areas or sleep in the same location or sh...
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Not a migrantAnimals that do not make seasonal movements and stay in their native home ranges all year round are called not migrants or residents.
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starts withThe Norway lemming is one of the largest lemmings around the globe. This migratory rodent is quite common in the tundras of Scandinavia and Western Russia. Individuals of both sexes exhibit similar size and color. The Norway lemming has a thick body. The fur is heavy, helping the animal keep warm during the cold winter months. Lemmings display the same coloration year-round - black and brown with golden-yellow bands. There is no information on the life expectancy of this species in the wild. However, the oldest recorded Norway lemming has lived for 3.3 years in captivity. In addition, other closely related lemmings typically live for 1 - 2 years.
This species is distributed throughout a region called Fennoscandia. It begins form the Russian Kola Peninsula, reaching the west coast of Norway as well as from the northern coast of Norway southwards to the Baltic Sea. Where the Norway lemmings are in abundance, they often migrate south. The ideal habitat of these rodents is tundra and alpine areas. Their winter habitat is usually secluded sites, covered with snow. When there is no snow, they prefer living in different moist environments such as bogs or marshes. They are also known to favor heathland habitat, dominated by dwarf shrubs.
Norway lemmings may be active at any time of the day. Overall, they are usually active for an average of 6 hours per day, during which time they mainly roam and look for food. These rodents tend to be solitary, coming into serious conflicts with each other in overcrowded territories. In these over-populated areas space and food are often in shortage, and the animals disperse to live independently. Males of this species exhibit boxing, wrestling, and threatening behavior. The communication and perception behavior of this species is insufficiently explored, although related lemming species are known to rely on scent, through which they mark their home ranges. In addition, most lemming species are able to recognize conspecifics by scent.
As herbivorous animals, Norway lemmings primarily feed upon mosses, lichens, bark, berries, roots, bulbs, shoots, supplementing this diet with various grasses.
There is no information about the mating system of Norway lemmings. However, considering characteristics of other lemmings and the independent nature of Norway lemmings, they are unlikely to be monogamous and may exhibit either polygynous or polygynandrous (promiscuous) mating systems (where both males and females may have multiple mates). Breeding occurs throughout the year. Females of this species are very productive, able to yield a litter every 3 - 4 weeks. Gestation period typically lasts for 16 - 23 days, producing 14 - 16 babies. The age of sexual maturity is 1 month old for males and 3 weeks old for females. However, there has been recorded a 2 week old pregnant female.
Currently, there aren’t any serious threats to the population of this species as a whole, although possible threats include environmental changes as well as habitat degradation as a result of grazing by other herbivorous species.
According to IUCN, the Norway lemming is generally common and widespread throughout its range but no overall population estimate is available. Currently, this species is classified as Least Concern (LC) and its numbers are stable.
In overcrowded areas, especially in tundra, where up to 134 lemmings sometimes share a single acre of land, these animals totally destruct the local vegetation. As a result, the area may take as long as 4 years to completely recover. Despite this terrible damage to the land, population peaks of the Norway lemmings are very beneficial for numerous predators of their range (Arctic foxes, red foxes, snowy owls).
