“It is the nature of the species that the differences are subtle. The main thing is that they are consistent. We looked at many different T-rexes, and our animal was consistently different from every known T-rex, in every bone,” Longrich he said.
The researchers said the differences included important traits. Fiorillo said the feature above the Tyrannosaurus eyes has been shown to be important in sexual selection.
“So, these differences mean that our animal ate differently and may have chosen mates differently than the more famous Tyrannosaurus rex,” Fiorillo said.
Tyrannosaurus had a huge head, tremendous bite force, walked on two strong legs and had thin arms. Perhaps the largest known T-rex is a specimen named Sue in the Field Museum in Chicago, which stood 40-1/2 feet (12.3 m) long.
The existence of T. macraensis changes our understanding of the origins of Tyrannosaurus, the researchers said. The researchers said T. macraensis was larger than other close relatives of tyrannosaurs that lived in northern North America before T-rex, suggesting that the group’s giant species evolved millions of years earlier than previously thought and were larger in southern North America. Came from America.