Tyrannosaurus rex were carnivores. A carnivore is an animal that gets its primary energy source from eating other animal tissue. Humans can be carnivorous too if they eat meats (animal tissue) such as chicken, beef, pork, or lamb. Most carnivores are predatory meaning they hunt or prey on another animals to get their food source. T. rex was one of the major predatory dinosaurs during its time; it preyed on other dinosaurs, other animals, and studies have shown that sometimes it preyed on other T. rex also. If you have ever seen the movie Jurassic Park, you can see how T. rex used to get its food.