Sunday, August 21, 2011

Life of Sei Whale

Life of Sea | Sei Whale (Balaenoptera borealis) | In July 2011, Danny Kerr, a photographer managed to take images on Sei whale in off the west coast, between Islay and Gigha, in Scotland. Sei whales are extremely rare seen. It is only seen nine times in the past 50 years. It is estimated their population only 30.000 in the world now. In nature, they live in worldwide in all oceans. They usually live in open sea, but they like to be in the coastal waters. They are not seen in polar and tropical waters. Although, the definite migration routes are still a mystery, but Sei whales migrate annually from cool and subpolar waters in summer to the warm and temperate waters in winter.
Scientific classification
Kingdom:     Animalia
Phylum:     Chordata
Class:     Mammalia
Order:     Cetacea
Suborder:     Mysticeti
Family:     Balaenopteridae
Genus:     Balaenoptera
Species:     B. borealis

Sei whaleare typically dark-steel gray. They have regural white to light gray markings on the surface of the pelvic fin toward the front of the lower body. They 32-60 notch along the bottom of the body. It causes the esophagus can be widened during the meal. The snout is pointed and the pectoral fin is shorter than other whales. They also have a single ridge extending from the tip of snout to the blowholes in pairs. This characteristic distiguish them to other Baleen whale. Sei whales usually travel alone or in small groups. It has a very little information their social structure. 
Sei whales are looked similar to other Baleen whales. An easy way to distinguish between Sei whales and the Bryde's Whale, is the presence of lateral ridges on the dorsal surface at the head of the Bryde's Whale. Sei whales can be confused with the Fin whale. Fin whales have clear asymmetrical arrangement color in their head. The right side of the lower jaw the Fin Whale is white, and the left side of gray. When viewed from the side, the upper head of the Sei Whale has a small indentation between the tip of the snout and eyes, while Fin whale is relatively flat.  

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