The iconic Tyrannosaurus rex, or "T. Rex," might need to be re-categorized into three distinct species, according to researchers.
The Tyrannosaurus rex is the only recognized species of the group of dinosaurs Tyrannosaurus to date – though previous research has reportedly acknowledged variation across Tyrannosaurs skeletal remains.
In a controversial new study published Tuesday in the peer-reviewed journal Evolutionary Biology, South Carolina and Maryland paleontologists conducted an analysis of skeletal remains they said reveal physical differences in the femur and other bones and dental structures.
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