An artist's conception of a fossil of a mammal the size of a chipmunk that skittered around during the dinosaur age, with a key feature in the evolution of mammals -- the middle ear bones. (Reuters Photo) Photo Gallery>>>

Scientists have unearthed a fossil of a mammal the size of a chipmunk that skittered around with the dinosaurs. Named Yanoconodon and illustrated here, the mammal has relatively short limbs of sprawling posture but a more elongate body by six more vertebrae than the 19 or 20 vertebrae of all other terrestrial mammals. (Reuters Photo) Photo Gallery>>>

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