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Sei Whale (Balaenoptera borealis)

Downward‑slanting snout shape

One ridge to the rostrum

Steel‑grey color with light scars

Narrow, upright dorsal fin

Thick tail stock

Body large, tail flukes small

Uniform color on lower lip

40-65 throats grooves that extend to navel

Slim flippers, dark underside

Pale underside, circular scar marks

  • Length: Medium‑large rorqual typically measuring 12–15 metres

  • Group Size: Usually solitary or in small groups of two–five

  • Key Features: Slender body, pointed snout, tall sickle‑shaped dorsal fin

Sei Whale 3.jpg

  • Behaviour: Very fast swimmer, shallow dives, surface skim‑feeding

  • Habitat: Temperate–subpolar offshore waters, avoiding tropics and poles

  • Conservation Status: Listed as Endangered on the ICUN Red List

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