Litter Size

How many babies does a Mount Pirri isthmus rat have at once? (litter size)

How many baby Mount Pirri isthmus rats are in a litter?

A Mount Pirri isthmus rat (Isthmomys pirrensis) usually gives birth to around 2 babies.

Upon birth, they weight 6.8 kg (14.99 lbs) and measure 1.3 cm (0′ 1″). They are a member of the Muridae family (genus: Isthmomys). An adult Mount Pirri isthmus rat grows up to a size of 35.4 cm (1′ 2″).

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 Mount Pirri isthmus rat (Isthmomys pirrensis) is a species of rodent in the family Cricetidae.Its natural habitat is subtropical or tropical moist lowland forests. It is found only in Panama. At the time of its discovery, it was considered as the “most common rat of southeastern Panama”. Found only in the eastern region of Darien, I. pirrensis appears to be a relict species confined to the Panamanian side of the Serrania del Darien. Its occurrence on the Colombian side of the Serrania has been suggested without documentation of specimens.Although neotomine-peromyscine rodents have historically been the subject of systematic research, studies involving Isthmomys have generally excluded I. flavidus due to its rarity in museum collections and the unavailability of tissue samples for molecular analysis. In addition, morphological and physiological studies involving I. flavidus used specimens from the Cerro Hoya locality which was originally proposed as a geographic race of I. pirrensis.

Other animals of the family Muridae

Mount Pirri isthmus rat is a member of the Muridae, as are these animals:

Animals that share a litter size with Mount Pirri isthmus rat

Those animals also give birth to 2 babies at once:

Animals with the same weight as a Mount Pirri isthmus rat

What other animals weight around 138 grams (0.3 lbs)?