Tyrannosaurus

Tyrannosaurus was the most popular dinosaur. For a century, Tyrannosaurus was the biggest theropod until the discovery of Gigantosaurus, Carcharodontosaurus and Spinosaurus. T-Rex was the only species of Tyrannosaurus, however Tarbosaurus, Gorgosaurus and Daspletosaurus were a species of Tyrannosaurus. At a length of 12 metres (or 13 metres), it was the biggest tyrannosaurid.