Monday, October 18, 2010

Why does a narwhal have such an immense and elaborate tusk?

http://www.thekidswindow.co.uk/images/CMScontent/Image/Narwhal.jpg
To impress mates?  Acquire food?  Battle foes?  Fool unicorn believers?  Canadian dental researchers have discovered that the tusk is extensively innervated and is therefore probably utilized to detect gradients of temperature, pressure, and suspended particles in the seawater.  Isn't evolution amazing?

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