Litter Size

How many babies does a Japanese house bat have at once? (litter size)

How many baby Japanese house bats are in a litter?

A Japanese house bat (Pipistrellus abramus) usually gives birth to around 2 babies.

Upon birth, they weight 1 grams (0 lbs) and measure 4 cm (0′ 2″). They are a member of the Vespertilionidae family (genus: Pipistrellus). An adult Japanese house bat grows up to a size of 56 cm (1′ 11″).

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 Japanese house bat is 2

The Japanese house bat or Japanese pipistrelle (Pipistrellus abramus) is a species of vesper bat. An adult has a body length of 3.6–4.8 cm (1.4–1.9 in), a tail of 2.9–4.0 cm (1.1–1.6 in), and a wing length of 3.2–3.6 cm (1.3–1.4 in). It prefers to roost under the ceiling or inside the roof of old buildings. It is found across East Asia, from China and Taiwan into the Ussuri region, the Korean Peninsula, and Japan.

Other animals of the family Vespertilionidae

Japanese house bat is a member of the Vespertilionidae, as are these animals:

Animals that share a litter size with Japanese house bat

Those animals also give birth to 2 babies at once:

Animals with the same weight as a Japanese house bat

What other animals weight around 5 grams (0.01 lbs)?