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

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

The top predator of the Jurassic and Cretaceous landscapes was usually a species of meat-eating dinosaur. These predators walked on two legs, had powerful jaws lined with sharp teeth and included species from groups known as tyrannosaurs, spinosaurs and carcharodontosaurs.