Has a long, sleek body that is bluish-gray to black with a pale underside.
Subtropical, temperate, and subpolar waters around the world
The Hawaiian stock has 40 to 80 and the eastern north Pacific has 35-55. No current estimates about the Nova Scotia and the western North Atlantic stock. The world wide total is 80,000.
They may migrate to higher latitudes during the sommer.
Social system/Group size
They are usually seen solitary or in groups of 2 - 5.
Ship strikes and entanglement in fishing gear.
A blow of a sei whale is 3.0 - 4.5 m high.