In a surprising find at the Freedom Mine in North Dakota, a shovel operator found a two-metre-long mammoth tusk buried in an old streambed estimated to be between 10,000 to 100,000 years old.

US coal miners discover mammoth tusk buried for thousands of years

In pics - Rare elephant tusk dating back around 500,000 years found in Israel

Elephants have them. Pigs have them. Narwhals and water deer have them. Tusks are among the most dramatic examples of mammal dentition: ever-growing, projecting teeth used for fighting, foraging, even flirting.

How did elephants and walruses get their tusks? It’s a long story.

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