These sleek predatory dinosaurs really are teenage T. rex

Sixty-six million years ago, the ground of western North America trembled with the footfalls of a tyrant: Tyrannosaurus rex. But despite a wealth of T. rex remains pulled from the region’s Cretaceous-period rocks, scientists have had few clues about how the celebrity dinosaur grew from a hatchling to a gargantuan predator—until now. In a study …

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