Litter Size

How many babies does a Sei whale have at once? (litter size)

How many baby Sei whales are in a litter?

A Sei whale (Balaenoptera borealis) usually gives birth to around 1 babies.

Each of those little ones spend around 334 days as a fetus before they are released into the wild. Upon birth, they weight 650 kg (1433 lbs) and measure 4.73 meter (15′ 7″). They are a member of the Balaenopteridae family (genus: Balaenoptera). An adult Sei whale grows up to a size of 17.44 meter (57′ 3″).

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 Sei whale is 1

The sei whale (, Balaenoptera borealis) is a baleen whale, the third-largest rorqual after the blue whale and the fin whale. It inhabits most oceans and adjoining seas, and prefers deep offshore waters. It avoids polar and tropical waters and semienclosed bodies of water. The sei whale migrates annually from cool, subpolar waters in summer to temperate, subtropical waters in winter with a lifespan of 70 years.Reaching 19.5 m (64 ft) long and weighing as much as 28 t (28 long tons; 31 short tons), the sei whale consumes an average of 900 kg (2,000 lb) of food every day; its diet consists primarily of copepods, krill, and other zooplankton. It is among the fastest of all cetaceans, and can reach speeds of up to 50 km/h (31 mph) (27 knots) over short distances. The whale’s name comes from the Norwegian word for pollock, a fish that appears off the coast of Norway at the same time of the year as the sei whale.Following large-scale commercial whaling during the late 19th and 20th centuries, when over 255,000 whales were killed, the sei whale is now internationally protected, although limited hunting occurs under a controversial research program conducted by Japan. As of 2008, its worldwide population was about 80,000, less than a third of its prewhaling population.

Other animals of the family Balaenopteridae

Sei whale is a member of the Balaenopteridae, as are these animals:

Animals that share a litter size with Sei whale

Those animals also give birth to 1 babies at once:

Animals that get as old as a Sei whale

Other animals that usually reach the age of 74 years:

Animals with the same weight as a Sei whale

What other animals weight around 22103.13 kg (48728.99 lbs)?

Animals with the same size as a Sei whale

Also reaching around 17.44 meter (57′ 3″) in size do these animals: