Life of Sea | Sei Whale (Balaenoptera borealis) | InJuly 2011, Danny Kerr, a photographermanaged to takeimageson Seiwhale in off the west coast, betweenIslayandGigha, in Scotland. Seiwhales are extremely rare seen. It is onlyseenninetimesin the past 50years. It is estimated their population only 30.000 in the world now. In nature, theyliveinworldwide in alloceans. Theyusually livein open sea, butthey like to be in thecoastal waters.They are not seen in polarandtropicalwaters. Although, the definitemigrationroutesare stilla mystery, but Seiwhales migrateannuallyfromcoolandsubpolarwatersin summerto thewarmand temperatewatersin winter.
Scientific classification Kingdom: Animalia Phylum: Chordata Class: Mammalia Order: Cetacea Suborder: Mysticeti Family: Balaenopteridae Genus: Balaenoptera Species: B. borealis
Seiwhales are typicallydark-steelgray. They haveregural white to light gray markingson thesurfaceof thepelvic fintowardthe front ofthe lower body.They32-60notchalong thebottomof the body. It causestheesophaguscan bewidenedduring the meal. The snout is pointedand thepectoral finis shorterthanotherwhales. They also have asingle ridge extendingfrom the tip ofsnout to theblowholesin pairs. This characteristic distiguish them to other Baleen whale. Seiwhalesusually travel aloneor insmall groups. It has a verylittle information theirsocialstructure. Seiwhales arelooked similar tootherBaleen whales. An easy waytodistinguish between Seiwhales andthe Bryde's Whale, isthepresence of lateral ridgeson the dorsal surfaceat the head ofthe Bryde's Whale.Seiwhalescan beconfused with the Fin whale. Fin whales have clear asymmetricalarrangement color in their head. The right side ofthe lowerjawtheFin Whaleis white, andthe left side ofgray. When viewed from theside, the upperhead ofthe Sei Whalehas asmallindentationbetween thetip of the snoutand eyes, while Fin whaleis relatively flat.