"Newly Discovered Dinosaur Subspecies in New Mexico Predates Tyrannosaurus Rex"

Researchers from the New Mexico Museum of Natural History and Science have identified a newly discovered dinosaur subspecies, Tyrannosaurus mcraeensis, as a more primitive and older relative of the Tyrannosaurus rex, reshaping the understanding of when the beast first arrived in North America. The discovery of a partial skull in western New Mexico led to the study, showing that the T. rex was in North America millions of years earlier than previously thought, suggesting it lived in what is now the southern U.S. at least 72 million years ago.