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

A massive predator once roamed the Earth, towering over its rivals and casting a long shadow on the ancestors of T. rex. This giant, now known as Ulughbegasaurus, ruled the prehistoric world around 90 ...

(CNN) — 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 ...

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“The snout bone was hollow rather than solid, and the bones around the eye didn’t have all the horns and bumps seen in T. rex or other tyrannosaurs.” Khankhuuluu mongoliensis, or a closely related ...