Cretaceous Period Tyrannosaurus rex Bonebed Discovery Egg Fossils Gondwana Dental Analysis Stegosaurus Joaquinraptor Fossils Patagonian Fossils Bayanshiree Formation Khankhuuluu Discovery Tyrannosaurus Fossils Lago Colhue Huapi Formation Ankylosaur Fossils Spicomellus afer Isle of Wight Spinosaurus Fossils Spinosaurus mirabilis Spinosaur Fossils Spinosaurus fossils Spinosaurus Discovery Changma Basin Icnitas in Burgos T. rex Fossils T. rex Teeth
A refined clumped‑isotope test on museum teeth provides the first direct enamel-based reading that indicates thermoregulated metabolism in this species.