Fearsome dinosaur-era marine reptile was the T. rex of the sea

May 29, 2026 12:22 PM

Fearsome dinosaur-era marine reptile was the T. rex of the sea

Tyrannosaurus rex was a huge land predator during the twilight of the age of dinosaurs. But it was not the only T. rex that terrorized the Cretaceous Period. There also was a marine reptile named Tylosaurus rex - the T. rex of the sea - that rivaled its land counterpart in size and ferocity. Scientists said they have identified Tylosaurus rex as a distinct species after a wide-ranging examination of previously discovered fossils. They made the judgment based on its enormous size, fine serration...

Study finds Tyrannosaurus rex did not reach full size until age 40

January 15, 2026 10:48 PM

Study finds Tyrannosaurus rex did not reach full size until age 40

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 how quickly T. rex achieved its maximum size has been a matter of debate. A new study examining bone tissue microstructure in the leg bones of 17 fossil specimens concludes that Tyrannosaurus took about 40 years to reach its maximum size of roughly 8 tons, some 15 years more than previously estimated. As part of the study, the res...