Litter Size

How many babies does a Northwestern deer mouse have at once? (litter size)

How many baby Northwestern deer mouses are in a litter?

A Northwestern deer mouse (Peromyscus sitkensis) usually gives birth to around 5 babies.With 2 litters per year, that sums up to a yearly offspring of 10 babies.

Upon birth, they weight 1 grams (0 lbs) and measure 1.3 cm (0′ 1″). They are a member of the Muridae family (genus: Peromyscus). An adult Northwestern deer mouse grows up to a size of 12.4 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 Northwestern deer mouse is 5

The northwestern deer mouse or Keen’s mouse (Peromyscus keeni) is a species of rodent in the family Cricetidae. It is found in British Columbia in Canada and in Alaska and Washington in the United States. It was named after the Rev. John Henry Keen in 1894.According to the study from “Spatial Variation in Population Dynamics of Sitka Mice in Floodplain Forests” which was published by Thomas A. Hanley and Jeffrey C. Barnard, the sitka mouse or Northwestern deer mouse has an interesting perspective regarding the floodplain and habitat. The article has done an experiment testing the relationship between floodplain habitat and has concluded that the floodplain forset does not necessarily makes a favorable habitat for sitka mouse.

Other animals of the family Muridae

Northwestern deer mouse is a member of the Muridae, as are these animals:

Animals that share a litter size with Northwestern deer mouse

Those animals also give birth to 5 babies at once:

Animals with the same weight as a Northwestern deer mouse

What other animals weight around 28 grams (0.06 lbs)?