The Tyrannosaurus Rex (T. rex) lived in the Late Cretaceous period (66-68 million years ago) in what is now North America. Some of the other dinosaurs that lived in the same time and place as the T. rex were:

- Triceratops: A large herbivorous dinosaur. They are the main prey of T. rex.
- Ankylosaurus: An armored dinosaur. T. rex had difficulty hunting these dinosaurs due to their armor.
- Edmontosaurus: A herbivorous dinosaur. A common prey of T. rex.
- Pachycephalosaurus: A carnivorous dinosaur with thick skull. 
- Hadrosaurs: A herbivorous dinosaur with multiple species. Another prey for T. rex.

These dinosaurs are the most well-known dinosaurs during the same time period and lived in the same area as the T. rex.
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