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Physical Description
     They have a long, sleek body that is dark bluish-gray to black in color and pale underneath
General CharacteristicsÂ
Head to Body Length: 40 – 60 feet ( 12 – 18 meters )
 Fin length
  Dorsal Fin Length : 1/3 of its body length
Pectoral flipper : 12 m – 15 m ( 39 – 49 ft )
Fluke : Is relatively small
 Range:  Atlantic, Indian and Pacific Oceans
Summer : They are commonly found in the Gulf of Maine, and on Georges Bank and Stellwagen Bank in the western North Atlantic.
Habitat: : Subtropical to Subpolar regions
Diet. :  They eat plankton (like copepods and krill), small schooling fish, and cephalopods (like squid)
Status:Â Endangered.
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 They estimate that the current worldwide population is about 80,000 individuals.
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After commercial whaling exhausted all known populations of this species, sei whales in the North Atlantic and North Pacific are considered to be relatively abundant by scientists say.
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The population in the Southern Ocean remains greatly depleted.
Reason for status: Commercial hunting and whaling, meat, and oil
Gestation :Â 10.5 – 12 months
Longevity:Â 74 Years in the wild