Deep in the deserts of ancient Mongolia, Tarbosaurus ruled as the apex predator of the Late Cretaceous. Closely related to Tyrannosaurus rex, this massive carnivore shared the same bone-crushing bite ...

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 ...

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 ...