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A beaver fossil found in western Montana is the oldest such specimen ever discovered. Find out how this 30-million-year-old missing link is helping to explain the astonishing diversity in mammal species on our planet.
By David Morton RintoulA beaver fossil found in western Montana is the oldest such specimen ever discovered. Find out how this 30-million-year-old missing link is helping to explain the astonishing diversity in mammal species on our planet.

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