The classic Tyrannosaurus rex, defined from a skeleton now housed ... comprehensive charting of the tyrant lizard king’s family tree. “No one hypothesis—whether it’s individual variation ...

The direct ancestor of Tyrannosaurus rex would have arrived ... data from the existing fossil record and the T. rex family tree, as well as climatic and environmental conditions, Morrison said.

If you’re interested in dinosaurs, you might be familiar with a group called the Theropods. Theropod translates to ‘beast-footed’, which gives you an idea of what this group of dinosaurs was like.