The Tyrannosaurus Rex Origin Story May Not Have Started in North America

New study adds to contentious debate about when, where, and how the massive dinosaur evolved.

By Paul Smaglik
May 8, 2025 7:30 PMMay 8, 2025 7:29 PM
Evolution after the Cretaceous Thermal Maximum
The end Cretaceous Northern Hemisphere fauna was dominated by Tyrannosaurids (such as Tyrannosaurus rex), hadrosaurs and ceratopsian ornithischian dinosaurs. (Image Credit: Pedro Salas and Sergey Krasovskiy.)

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Paleontologists have long considered Tyrannosaurus rex a North American reptile, but a study now claims that the king of the dinosaurs’ predecessor hailed from the Far East.

The cousin megaraptors likely lumbered from one continent to another via land bridge more than 70 million years ago — perhaps in an attempt to beat the heat, according to an article in the journal Royal Society Open Science. The finding is potentially controversial, because paleontologists have long debated T. rex’s origins.

Finding T. rex's Origin

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