Lucky Find Uncovers a Marvelous Fossil Mammal

Mesozoic mammals were fascinating little beasts. They burrowed, climbed, glided, and swam through the Age of Dinosaurs, not as underdogs waiting for their moment to be free of the great reptiles, but as varied, successful creatures. And they keep getting stranger. Mammals previously known only from their dentition are starting to come into view thanks to the discovery of skulls and skeletons. The latest to debut is Vintana sertichi - what looks like a Mesozoic muskrat with some evolutionary tales to tell.

Vintana was a lucky find. The mammal's skull was hidden inside a 150 pound chunk of sandstone collected from the 72-66 million year old ...

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