Mammal / Balaenoptera borealis
Sei Whale
High risk of extinction in the wild
Vagrant
The sei whale 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 semi-enclosed 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.
- Average mass
- 2e+07 g
- Breeding interval
- Females typically give birth every other year
- Breeding season
- Mating occurs during the winter months
- Average number of offspring
- 1
- Average number of offspring
- 1
- Range gestation period
- 10.5 to 12 months
- Range weaning age
- 6 to 7 months
- Average age at sexual or reproductive maturity (female)
- 10 years
- Average age at sexual or reproductive maturity (female)
Sex: female - 3652 days
- Average age at sexual or reproductive maturity (male)
- 10 years
- Average age at sexual or reproductive maturity (male)
Sex: male - 3652 days
- Average lifespan
Status: wild - 70.0 years
- Average lifespan
Status: wild - 74.0 years
Shefferly, N. 1999. "Balaenoptera borealis" (On-line), Animal Diversity Web. Accessed November 10, 2020 at https://animaldiversity.org/accounts/Balaenoptera_borealis/
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