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Litter Size

How many babies does a Salt marsh harvest mouse have at once? (litter size)

How many baby Salt marsh harvest mouses are in a litter?

A Salt marsh harvest mouse (Reithrodontomys raviventris) usually gives birth to around 3 babies.With 1 litters per year, that sums up to a yearly offspring of 3 babies.

Each of those little ones spend around 22 days as a fetus before they are released into the wild. Upon birth, they weight 1 grams (0 lbs) and measure 4.2 cm (0′ 2″). They are a member of the Muridae family (genus: Reithrodontomys). An adult Salt marsh harvest mouse grows up to a size of 7 cm (0′ 3″).

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 Salt marsh harvest mouse is 3

The salt marsh harvest mouse (Reithrodontomys raviventris), also known as the red-bellied harvest mouse and sometimes called the saltmarsh harvest mouse, is an endangered rodent endemic to the San Francisco Bay Area salt marshes in CA. There are two distinct subspecies, both endangered and listed together on federal and state endangered species lists. The northern subspecies (Reithrodontomys raviventris halicoetes) is lighter in color and inhabits the northern marshes of the bay, and the southern subspecies (Reithrodontomys raviventris raviventris) lives in the East and South Bay marshes. They are both quite similar in appearance to their congener species, the [Western harvest mouse, R. megalotis], to which they are not closely related. Genetic studies of the northern subspecies have revealed that the salt marsh harvest mouse is most closely related to the plains harvest mouse, R. montanus, (), which occurs now in the Midwest]. Its endangered designation is due to its limited range, historic decline in population and continuing threat of habitat loss due to development encroachment at the perimeter of San Francisco Bay.

Other animals of the family Muridae

Salt marsh harvest mouse is a member of the Muridae, as are these animals:

Animals that share a litter size with Salt marsh harvest mouse

Those animals also give birth to 3 babies at once:

Animals that get as old as a Salt marsh harvest mouse

Other animals that usually reach the age of 2.58 years:

Animals with the same weight as a Salt marsh harvest mouse

What other animals weight around 10 grams (0.02 lbs)?

Animals with the same size as a Salt marsh harvest mouse

Also reaching around 7 cm (0′ 3″) in size do these animals: