Animal Size

Sei whale size: How big do they get?

How big does a Sei whale get? Here is an overview over the average adult age:

A grown Sei whale (Balaenoptera borealis) reaches an average size of 17.44 meter (57′ 3″).

When born, they have an average size of 0 cm (0′ 0″). During their lifetime of about 74 years, they grow from 650 kg (1433 lbs) to 22103.13 kg (48728.99 lbs). A Sei whale has 1 babies at once. The Sei whale (genus: Balaenoptera) is a member of the family Balaenopteridae.

As a reference: Humans reach an average body size of 1.65m (5′ 5″) while carrying 62 kg (137 lbs). A human woman is pregnant for 280 days (40 weeks) and on average become 75 years old.

The average adult size of a Sei whale is  (57' 3

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.

Animals of the same family as a Sei whale

We found other animals of the Balaenopteridae family:

Animals with the same size as a Sei whale

Not that size really matters, but it makes things comparable. So here are a couple of animals that are as big as Sei whale:

Animals with the same litter size as a Sei whale

Here is a list of animals that have the same number of babies per litter (1) as a Sei whale:

Animals with the same life expectancy as a Sei whale

Completely different animals, but becoming as old as a Sei whale:

Animals with the same weight as a Sei whale

As a comparison, here are some other animals that weight as much as the Balaenoptera borealis: