Darla K. Zelenitsky

Tyrannosaurus Rex was the top predator in North America just before dinosaurs went extinct at the end of the Cretaceous Period. (Shutterstock)

The discovery of two giant dinosaur species solves the mystery of missing apex predators in North America and Asia

Two recent discoveries in Alberta and Uzbekistan have identified the top predators in those regions during the Cretaceous period. Fossils that had been in storage for years included the jawbones.

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