Tyrannosaurus rex may actually be three separate species

Was Spinosaurus Bigger Than T-Rex?

New research shows 'juvenile' T. rex fossils are a distinct species of small tyrannosaur

Specimens of Tyrannosaurus - Wikipedia

Tyrannosaur, Size, Species, & Facts

Tyrannosaurus rex may have been misunderstood

They Want to Break T. Rex Into 3 Species. Paleontologists Aren't Pleased. - The New York Times

Tyrannosaurus rex may have been three species researchers claim - BBC Newsround

WATCH: Did the T-Rex actually have feathers and wings like an ostrich?

Study Refutes Controversial Research That Divided the T. Rex Into Three Species, Smart News

T. rex may have had lips like a modern lizard's

How many T. rexes were there? Billions.