Tyrannosaurus rex may have been three species, scientists say

A Tyrannosaurus rex skeleton at the French National Museum of Natural History in Paris. Photograph: Philippe Wojazer/Reuters

With its immense size, dagger-like teeth and sharp claws, Tyrannosaurus rex was a fearsome predator that once terrorised North America. Now researchers studying its fossils have suggested the beast may not have been the only tyrannosaurus species.

Experts studying remains thought to belong to T rex have suggested their variation shows evidence of not one species but three.