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Narwhal

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Narwhal

Post by sujin007 on Sun Nov 18, 2012 8:21 pm

The Narwhal is an Arctic species of cetacean. It is one of two species of white whale, the other being the Beluga whale. But most of the people are unaware of this species..
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Re: Narwhal

Post by sujin007 on Sun Nov 18, 2012 8:23 pm

The most conspicuous characteristic of male narwhal is their single extraordinarily long tusk, an incisor that projects from the left side of the upper jaw and forms a left-handed helix.

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Re: Narwhal

Post by sujin007 on Sun Nov 18, 2012 8:25 pm

The tusk can be up to nearly 10 feet long and weigh up to 22 pounds. About one in 500 males has two tusks, which occurs when the right tooth, normally small, also grows out.

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Re: Narwhal

Post by sujin007 on Sun Nov 18, 2012 8:26 pm

The purpose of the tusk has been the subject of much debate. Early scientific theories suggested that the tusk was used to pierce the ice covering the narwhal’s Arctic Sea habitat.

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Re: Narwhal

Post by sujin007 on Sun Nov 18, 2012 8:29 pm

Others suggested the tusk was used in echolocation. More recently, scientists believed the tusk is primarily used for showmanship and for dominance..

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