The statement that "T. rex ate other T. rex" is not entirely accurate. While Tyrannosaurus rex was a powerful predator that dominated its ecosystem, evidence suggests that it did not primarily feed on other T. rex.

Cannibalism in T. rex has been proposed based on the study of certain fossil evidence. For example, paleontologists have observed bite marks on T. rex bones that resemble the dental patterns of T. rex teeth. However, these marks could have been caused by scavenging rather than deliberate predation.

In addition to the lack of conclusive evidence for T. rex cannibalism, there are several practical considerations that make it unlikely to have been a common occurrence. T. rex was an apex predator, meaning that it was at the top of the food chain and had few natural predators. Adult T. rex individuals were likely too large and powerful for other T. rex to subdue and consume.

However, interactions between T. rex and younger individuals or weakened individuals cannot be ruled out. Paleontologists have suggested that T. rex may have opportunistically scavenged on dead or dying members of its own species, similar to the behavior observed in modern-day predators such as lions or grizzly bears.

Ultimately, while it is possible that T. rex engaged in occasional cannibalism, it is more likely that the species primarily hunted other herbivorous dinosaurs and scavenged on a variety of carcasses when available.