WASHINGTON (Reuters) - You might call the Jurassic Period meat-eating dinosaur Allosaurus the ultimate big mouth. A new study analysing dinosaur jaw musculature found that this fearsome hunter that ...

For decades, scientists have been counting annual growth rings—similar to tree rings—inside fossilized leg bones of Tyrannosaurus rex to estimate how old the giant carnivores were when they died and ...

For decades, a small tyrannosaur skull has divided paleontologists over whether it belonged to a separate species or a teenage Tyrannosaurus rex. New research anchored in the spectacular “Dueling ...

WASHINGTON, Jan 15 (Reuters) - There is no question that Tyrannosaurus rex got big. In fact, this fearsome dinosaur may have been Earth's most massive land predator of all time. But the question of ...