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5 million-year-old tooth from Tennessee belongs to house cat-size flying squirrel

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Researchers identified the fossil from a tooth found in an ancient sinkhole in Tennessee .

The specimen belongs to an extinct genus called Miopetaurista , which are more commonly found in Asia .

The species were as big as house cats and weighed around 3.3 pounds ( 1.5 kilograms ) They lived in warm forests in Tennessee that were similar to those in Asia at the time.