Mammal bites dinosaur in 'once-in-a-lifetime' fossil find

A badger-like mammal was sinking its teeth into the ribs of a dinosaur three times its size when they were buried in volcanic ash 125 million years ago, capturing the pair in a deadly embrace.The mammal -- one of the largest of its time but still a third the weight of the dinosaur -- is sinking his sharp teeth into the dinosaur's ribs and gripping onto its leg.