Litter Size

How many babies does a Black rat have at once? (litter size)

How many baby Black rats are in a litter?

A Black rat (Rattus rattus) usually gives birth to around 5 babies.With 3 litters per year, that sums up to a yearly offspring of 15 babies.

Each of those little ones spend around 23 days as a fetus before they are released into the wild. Upon birth, they weight 4 grams (0.01 lbs) and measure 4.2 cm (0′ 2″). They are a member of the Muridae family (genus: Rattus). An adult Black rat grows up to a size of 19.4 cm (0′ 8″).

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 Black rat is 5

The black rat (Rattus rattus), also known as ship rat, roof rat, or house rat—is a common long-tailed rodent of the stereotypical rat genus Rattus, in the subfamily Murinae.The black rat is black to light brown in colour with a lighter underside. It is a generalist omnivore and a serious pest to farmers because it feeds on a wide range of agricultural crops. It is sometimes kept as a pet. In parts of India, it is considered sacred and respected in the Karni Mata Temple in Deshnoke.

Other animals of the family Muridae

Black rat is a member of the Muridae, as are these animals:

Animals that share a litter size with Black rat

Those animals also give birth to 5 babies at once:

Animals that get as old as a Black rat

Other animals that usually reach the age of 4.17 years:

Animals with the same weight as a Black rat

What other animals weight around 142 grams (0.31 lbs)?

Animals with the same size as a Black rat

Also reaching around 19.4 cm (0′ 8″) in size do these animals: