Smithsonian Magazine · People & society

Five Discoveries That Changed Our Understanding of T. Rex

Scientific understanding of Tyrannosaurus rex has evolved significantly since its 1905 discovery, moving from a slow, swamp-dwelling monster to a more complex predator. Five key discoveries have reshaped our view of this iconic dinosaur.

T. rex's small arms are now seen as a biomechanical necessity for its massive head and powerful bite, allowing for stronger neck muscles. Prey was likely captured and processed with its mouth.

Contrary to popular depictions, T. rex likely had lips covering its teeth, similar to modern Komodo dragons, to protect them.

T. rex was not a fast runner (est. 12 mph) but evidence suggests it was an active hunter, likely using ambush tactics and targeting vulnerable prey or scavenging.

Recent research suggests T. rex was warm-blooded, maintaining a constant body temperature around 97°F. This required significant food intake and allowed it to inhabit diverse climates.

While direct evidence is lacking for T. rex, feathers on related tyrannosaurs suggest it may have had some plumage, possibly sparse filaments to avoid overheating.

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