Dinosaur bones are like trees—every year is represented by a new ring, and paleontologists can count those concentric circles ...

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

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

Almost everyone has heard of Tyrannosaurus rex, but how much do you actually know about this iconic dinosaur predator? Take ...

A provocative study published earlier this year proposed that the world's best-known and perhaps best-loved dinosaur, Tyrannosaurus rex, was actually three separate species. Not so fast, says new ...

The name conjures up a specific mental image in most everyone — particularly 8-year-olds. The mighty tyrannical dinosaur king stomped across North America millions upon millions of years ago. But was ...

The dinosaur king may yet retain its crown. Earlier this year a study proposed that the iconic Tyrannosaurus rex should be split into three distinct species, but a new analysis says there isn’t enough ...

A provocative study published earlier this year proposed that the world’s best-known and perhaps best-loved dinosaur, Tyrannosaurus rex, was actually three separate species. Not so fast, says new ...

Tyrannosaurus rex was a fearsome predator, but it sure wasn't a particularly fast mover. In fact, most humans could easily keep up with the dinosaur without breaking a sweat. T. rex would have covered ...

A study published this week proposes three species of Tyrannosaurus instead of the long-accepted single species rex. The researchers analyzed dozens of T. rex specimens, of which there are only about ...

A team of researchers published a rebuttal to an argument advanced by another group earlier in the year. The disagreement over the king of dinosaurs is far from over. By Jack Tamisiea The world’s most ...