After T. rex was first described in 1905, the world’s most charismatic megafossil could have turned out to be a mere curiosity. Tyrannosaurus rex is still the biggest, baddest land predator of all ...

There is no question that Tyrannosaurus rex got big. In fact, this fearsome dinosaur may have been Earth's most massive land predator of all time. But the question of how quickly T-rex achieved its ...

A fossil tyrannosaur pulled from the badlands of southern New Mexico has forced paleontologists to rethink when giant predatory dinosaurs first reached extreme body sizes in North America. The ...