Tyrannosaurus rex lived longer and took more time to reach its maximum size than previously thought, according to a new study ...

For decades, scientists have been counting annual growth rings—similar to tree rings—inside fossilized leg bones of ...

The largest-ever study of how the “king of dinosaurs” grew shows a much longer, slower path to adulthood than scientists ...

When you look at a fossil on display, you may envision the world 66 million years ago. You might feel the earth shake beneath you as a large predator stalks the ancient floodplain. It has long, sharp ...

Scientists have identified a previously unknown 86 million-year-old dinosaur species that fills an early gap in the fossil record of tyrannosaurs, revealing how they evolved to become massive apex ...

For decades, scientists have been counting annual growth rings—similar to tree rings—inside fossilized leg bones of ...

While Tarbosaurus, an ancestor of T. rex, clocked in at between 3,000 and 6,000 kilograms (6,613 pounds and 13,227 pounds), the fleet-footed Khankhuuluu mongoliensis likely weighed only around 750 ...