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:
- Rakali with 3 babies per pregnancy
- Eligmodontia typus with 6 babies per pregnancy
- Large tree mouse with 2 babies per pregnancy
- Rupp’s mouse weighting only 48 grams
- Smoky mouse weighting only 68 grams
- Monte gerbil mouse weighting only 18 grams
- Abrothrix andinus weighting only 18 grams
- Large vlei rat with 3 babies per pregnancy
- Marmoset rat weighting only 70 grams
- Oecomys superans weighting only 73 grams
Animals that share a litter size with Waterhouse’s swamp rat
Those animals also give birth to 3 babies at once:
- Yellow-nosed cotton rat
- Crosse’s shrew
- Oryzomys couesi
- Stella wood mouse
- Juniper vole
- Black-tailed dasyure
- Allen’s squirrel
- Taiwanese brown-toothed shrew
- Alpine pika
- Flat-headed shrew
Animals with the same weight as a Waterhouse’s swamp rat
What other animals weight around 146 grams (0.32 lbs)?
- Common treeshrew weighting 132 grams
- Steppe pika weighting 143 grams
- Pygmy ringtail possum weighting 152 grams
- New Caledonia flying fox weighting 151 grams
- Lewis’s tuco-tuco weighting 117 grams
- Middle East blind mole-rat weighting 164 grams
- Egyptian fruit bat weighting 134 grams
- Ribboned rope squirrel weighting 141 grams
- Bare-tailed woolly mouse opossum weighting 119 grams
- Egyptian fruit bat weighting 132 grams