Researchers have controversially argued there is enough variation in samples to point towards three species of Tyrannosaur, not one.
T-Rex Should be Divided into Three Species, Say These Researchers - News18
T-rex reigns as king of dinosaurs
Steve Brusatte, paleontologist: 'The most terrifying thing about the tyrannosaurus was not its jaws but its intelligence', Culture
They Want to Break T. Rex Into 3 Species. Paleontologists Aren't Pleased. - The New York Times
13 Things Paleontologists Got Wrong About Tyrannosaurus Rex
This controversial paper says T. Rex is really three different species
Was there more than one species of Tyrannosaurus? Charleston professor thinks there may have been.
Tyrannosaurus rex may have been three separate species, say scientists, rex
Study Claiming T. rex Was Three Separate Species Receives Rebuttal
Controversial idea that T. rex was three species comes under fire
Tyrannosaurus rex may have been misunderstood
Is T. rex really three different species? There's debate.