A team of scientists from the American Museum of Natural History and Carthage College concluded that there was insufficient evidence for such a bold statement.
In March 2022, an article was published in which the authors proposed that the Tyrannosaurus should be distinguished by three whole species: massive, geological, older emperor.
They were based on differences in the physical characteristics between the samples; some have one thin incisor on both sides of the jaw, while others have two on each side; and some of the skeletons have strong thighs, while others have more graceful thighs.
The authors of the new work revised the baseline data and performed their measurements and analysis of the same samples, and it turned out that the differences in the structure of the legs and the jaws and teeth of different Tyrannosaurs were less pronounced than in other extinct species of dinosaurs, as well as in modern birds.
This means that different groups of tyrannosaurs may have belonged to one rather than three different species of ancient lizards.