Thanks to movies like "Jurassic Park," the image of the mighty Tyrannosaurus rex looms large in the popular imagination, but ...

Tyrannosaurus rex is a carnivorous icon. Exceeding 40 feet in length and nine tons, the bone-crushing giant stands out as the largest and last of its meat-eating family.

More than 85 million years ago, a smaller-bodied ancestor of the Tyrannosaurus rex roamed the plains of Mongolia. The dinosaur's identity was unknown — until now. In a study published Wednesday ...