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 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:
- Arabian pipistrelle weighting only 3 grams
- Brazilian brown bat with 1 babies per pregnancy
- Pipistrellus babu weighting only 4 grams
- Cape serotine with 1 babies per pregnancy
- Southwestern myotis with 1 babies per pregnancy
- Great evening bat weighting only 49 grams
- Robust yellow bat raching a size of 15.2 cm (0′ 6″)
- Dark-winged lesser house bat with 1 babies per pregnancy
- Eastern long-fingered bat with 1 babies per pregnancy
- California myotis becoming 15 years old
Animals that share a litter size with Japanese house bat
Those animals also give birth to 2 babies at once:
- California red tree mouse
- Japanese hare
- Northern pygmy mouse
- Greater dwarf shrew
- Rock hyrax
- Crested porcupine
- Mediterranean pine vole
- Black-headed marmoset
- Asian particolored bat
- Common mole-rat
Animals with the same weight as a Japanese house bat
What other animals weight around 5 grams (0.01 lbs)?
- Long-tailed planigale weighting 6 grams
- Peters’s musk shrew weighting 6 grams
- Little yellow bat weighting 4 grams
- Yuma myotis weighting 5 grams
- Dormer’s bat weighting 6 grams
- Lesser horseshoe bat weighting 4 grams
- Gray sac-winged bat weighting 6 grams
- Large forest bat weighting 6 grams
- Montane myotis weighting 5 grams
- Eisentraut’s pipistrelle weighting 6 grams