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There were several subtle differences between these remains and those of a T. rex, including a slightly different jawbone structure. An artist's conception shows Tyrannosaurus mcraeensis.

The world’s understanding of the Tyrannosaurus rex as a fearsome-looking predator with a face of razor-sharp fanged teeth may soon need to shift. Similar to humans, the T. rex had lips that ...

"It's not impossible" that T. mcraeensis could have been even larger than T. rex, Longrich said. "Since we only have one individual, it's unlikely we've found the biggest individuals of the species." ...

"Dozens of T. rex fossils have been unearthed in North America but our findings indicate that the fossils of T. rex's direct ancestor ... They used mathematical models drawing on fossils ...