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The Tyrannosaurus is one of the largest theropods that we know of. It was estimated to be around 13 m long, weighing around 6,5 tons. Its skull was relatively massive, tapered in the frontal part, and could exceed 1,5 m in the largest specimens. Its teeth were knife-like shaped, cambered, marked with indentation on both frontal and back sides, and exceeding 30 cm in length. A Tyrannosaurus' arms had two extremely short digits (max. 1 m long). The tail is long and thick. Juvenile specimens were probably feathered. Tyrannosaurus was the Late Cretaceous period's top predator in the territory of North America (68‒66 Ma). ## Keywords Mesozoic, Upper Cretaceous, dinosaurs, Saurischia, Theropoda, Tyrannosauridae
