T. rex evolved in North America from Asian ancestors. Climate shifts and extinction events helped tyrannosaurids and ...

For more than a decade, paleontologists have speculated about a single fossil that preserves skeletons of two of the world’s most famous dinosaurs, Tyrannosaurus ... and a juvenile T. rex ...

One of the most recognizable landmarks in Tucson — especially by the city's younger generations — the two-story Tyrannosaurus rex was installed by Michelle and Michael Retzer, who have owned ...