Litter Size

How many babies does a Waterhouse’s swamp rat have at once? (litter size)

How many baby Waterhouse’s swamp rats are in a litter?

A Waterhouse’s swamp rat (Scapteromys tumidus) usually gives birth to around 3 babies.

Upon birth, they weight 3 grams (0.01 lbs) and measure 1.6 cm (0′ 1″). They are a member of the Muridae family (genus: Scapteromys). An adult Waterhouse’s swamp rat grows up to a size of 8.7 cm (0′ 4″).

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.

Waterhouse’s swamp rat (Scapteromys tumidus) is a semiaquatic rodent species from South America. It is found in southern Brazil, Uruguay and northern Argentina, where it lives in freshwater and salt marshes, as well as open grassland of the pampas. Its karyotype has 2n = 24, substantially lower than its closest relative S. aquaticus with 2n = 32.

Other animals of the family Muridae

Waterhouse’s swamp rat is a member of the Muridae, as are these animals:

Animals that share a litter size with Waterhouse’s swamp rat

Those animals also give birth to 3 babies at once:

Animals with the same weight as a Waterhouse’s swamp rat

What other animals weight around 146 grams (0.32 lbs)?