Scientists Probe Why T. rex Had 3-Foot Arms as 45-Foot Bodies Evolved Bigger Skulls
Updated
Updated · The Conversation · May 11
Scientists Probe Why T. rex Had 3-Foot Arms as 45-Foot Bodies Evolved Bigger Skulls
5 articles · Updated · The Conversation · May 11
T. rex arms measured only about 3 feet on animals up to 45 feet long, and scientists still lack a definitive explanation for what those limbs did.
Fossil evidence shows theropod arms generally shortened as skulls grew larger, making bigger heads the clearest evolutionary pattern tied to T. rex’s tiny forelimbs.
Researchers have floated several functions—display, gripping prey, or avoiding bites while feeding in groups—but none has strong fossil support, and the jaws likely reached targets first.
Another possibility is that the arms became vestigial, with no major purpose, underscoring that some evolutionary changes persist even when their benefit remains unclear.
A 'missing link' fossil reveals complex arm evolution. What does this discovery mean for the T. rex arm mystery?
New scans show T. rex's arm bones were stress-free. Does this finally debunk the 'arms as weapons' theory?