Tyrannosaurus rex (often called T. rex) is one of the most iconic dinosaurs ever discovered. It was a massive meat-eating theropod that lived in western North America during the Late Cretaceous, near the very end of the dinosaur era.
Appearance
T. rex had a huge skull, thick neck muscles, and a powerful body built for strength. Its jaws held thick, banana-shaped teeth designed to withstand enormous forces. The forelimbs were short but strongly muscled, ending in two claws, while the hind legs were large and supported its heavy frame.
Size
Length: 12–13 m (40–43 ft)
Weight: 6–9 t (6,000–9,000 kg)
Group / clade: Theropod
Diet and Hunting
T. rex was a carnivore. It likely hunted large herbivores such as hadrosaurs (“duck-billed dinosaurs”) and horned dinosaurs. Many researchers also think it could scavenge when food was available. Its strong sense of smell and robust teeth would have been useful for both hunting and feeding on carcasses.
Habitat and Range
T. rex lived in North America on the western landmass known as Laramidia. Its world included river systems, floodplains, forests, and coastal environments. Fossils are strongly associated with formations such as the Hell Creek Formation and the Lance Formation.
Behavior
As a top predator, T. rex probably played a major role in shaping the ecosystem. Juveniles were more lightly built than adults and may have been faster, possibly hunting smaller or different prey. As individuals grew, they became heavier and more powerful, shifting toward large prey and a dominance-based feeding strategy.
Discovery
Although tyrannosaur fossils were found earlier, Tyrannosaurus rex was formally described in the early 20th century. Since then, additional specimens—some very complete—have helped scientists reconstruct its anatomy, growth, and ecology in increasing detail.
Why T. rex Is So Famous
Its enormous skull and impressive bite strength.
Many well-preserved specimens that allow detailed study.
A dramatic role as a “final-era” apex predator near the end of the Cretaceous.
