Fossils on display at the Museum of the Rockies in the US show a rare sighting of dinosaur predators. This is the skull of Edmontosaurus (a member of the duck-billed dinosaur family), which has a stuck Tyrannosaurus rex tooth. The fossil was discovered in 2005 in the Hell Creek Formation in eastern Montana. Its age is estimated at 66 million years – this is the end of the age of dinosaurs.
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