The secret of the narwhal’s tusk

Turns out the 1.5-metre tooth that emerges from the left side of the upper jaw of the narwhal is something unique in the animal world: a sensory probe with more than 10 million nerve connections that tunnel from the tusk’s core to its surface.

Cool. And wouldn’t “The Secret of the Narwhal’s Tusk” be a great title for a Nancy Drew or Hardy Boys mystery?

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