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Litter Size

How many babies does a Norway lemming have at once? (litter size)

How many baby Norway lemmings are in a litter?

A Norway lemming (Lemmus lemmus) usually gives birth to around 5 babies.With 3 litters per year, that sums up to a yearly offspring of 15 babies.

Each of those little ones spend around 20 days as a fetus before they are released into the wild. Upon birth, they weight 3 grams (0.01 lbs) and measure 1.4 cm (0′ 1″). They are a member of the Muridae family (genus: Lemmus). An adult Norway lemming grows up to a size of 10.3 cm (0′ 5″).

To have a reference: Humans obviously usually have a litter size of one ;). Their babies are in the womb of their mother for 280 days (40 weeks) and reach an average size of 1.65m (5′ 5″). They weight in at 62 kg (137 lbs), which is obviously highly individual, and reach an average age of 75 years.

The average litter size of a Norway lemming is 5

The Norway lemming, also Norwegian lemming (Lemmus lemmus) is a common species of lemming found in northern Fennoscandia. 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.

Other animals of the family Muridae

Norway lemming is a member of the Muridae, as are these animals:

Animals that share a litter size with Norway lemming

Those animals also give birth to 5 babies at once:

Animals that get as old as a Norway lemming

Other animals that usually reach the age of 2 years:

Animals with the same weight as a Norway lemming

What other animals weight around 67 grams (0.15 lbs)?