Earliest-known mammal, identified by its fossilized teeth, was digging burrows while dinosaurs were still evolving

This 'shrew-like' animal is surprisingly old.

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Rio Grande Do Sul ,Brazil ,London ,City Of ,United Kingdom ,Porto Alegre ,Moya Meredith Smith ,Martha Richter ,London King College ,Anatomical Society ,History Museum ,University Of Rio Grande Do Sul ,Late Triassic ,Rio Grande ,Scientific Associate ,London King ,College London ,Federal University ,Prof Moya Meredith Smith ,Emeritus Professor ,Dentoskeletal Anatomy ,