Tyrannosaurus is a genus of large theropod dinosaur from the Late Cretaceous period, about 68-66 mya (million years ago). Widely known as T. rex (or, incorrectly, T. Rex or T-Rex), the name Tyrannosaurus rex means "Tyrant lizard king" in Greek. T. rex was one of the best known prehistoric animals to have ever lived.

In Dinosaur PlanetEdit

"Little Das' Hunt"Edit

Tyrannosaurus makes two minor appearances in Little Das' Hunt. First, Tyrannosaurus is the main subject of the first Palaeontology Segment, where Scott Sampson discusses T. rex and its speed. An original model is not shown at this point; only stock footage from Discovery's earlier documentaries from 2001 (When Dinosaurs Roamed America and Valley of the T-Rex) are shown, just with replaced sound effects.

At the end of the episode, which fast forwards to 68 million years ago, it has shown that Daspletosaurus has evolved into Tyrannosaurus rex. During the scene, a mother T. rex and her male offspring watch as two adolescent Edmontosaurus move together. One of the adolescents turns and looks at the juvenile T. rex, while the juvenile T. rex roars towards it as the episode ends.

In palaeontologyEdit

In real life, the largest specimens of Tyrannosaurus rex measured around 12 meters(40 feet) long, standing 3.9 meters (13 feet) tall, and weighed about 8 tons (7,620 kg), meaning this dinosaur was one of the largest predatory dinosaurs ever to have existed. It was one of the largest terrestrial carnivores in North America. The largest T. rex skulls measure up to 1.45 meters (4.8 feet) in length, not as long as some other skull lengths of carnivores such as Carcharodontosaurus, but still massive.


  • Tyrannosaurus did not evolve from Daspletosaurus as the episode suggests.
  • The episode puts Tyrannosaurus in The Two Medicine Formation when specimens have only been found in The Hell Creek and Lance Formation.
  • The juvenile Tyrannosaurus has the same proportions as the adult when fossil evidence shows that juvenile Tyrannosaurs looked very different from the adults.
  • They are the largest theropods, next to the Carcharodontosaurs, in the series


Community content is available under CC-BY-SA unless otherwise noted.