Tyrannosaurus Rex was from the Cretaceous. It ate large dinosaurs, like Triceratops. Some scientists think that Tyrannosaurus could eat more than 200 pounds of meat in one bite. Tyrannosaurus lived during the Cretaceous in Western North America. Most notable Tyrannosaurus Rex is the Tyrannosaurus family Annie, Boris, Dolores and Pteranodon family Buddy.