Narwhals: Arctic Whales With Super-Sensing Tusks

Tusking Arctic Narwhals
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The spirals on narwhal tusks, seen in this collection at the Zoological Museum at the University of Copenhagen in Denmark, may limit fractures, which appear along perpendicular lines, according to scientists studying the Arctic whales' teeth. The spiral may also aid the tusk's relatively straight growth during development.

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Photograph by Joseph Meehan
 
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