Litter Size

How many babies does a Tres Marías Island mouse have at once? (litter size)

How many baby Tres Marías Island mouses are in a litter?

A Tres Marías Island mouse (Peromyscus madrensis) usually gives birth to around 2 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 Tres Marías Island mouse grows up to a size of 9.4 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.

The Tres Marías island mouse or Tres Marías deer mouse (Peromyscus madrensis) is a species of rodent in the family Cricetidae. It is found only on the Islas Marías off the west coast of Mexico (part of the state of Nayarit). When last assessed, it was common on María Cleofás Island, but rare or absent on the other, more disturbed, islands.

Other animals of the family Muridae

Tres Marías Island mouse is a member of the Muridae, as are these animals:

Animals that share a litter size with Tres Marías Island mouse

Those animals also give birth to 2 babies at once: