Meraxes, a newly discovered dinosaur species, was found to have tiny arms like a T. rex, despite not being a close relative.

Predecessors of the T.rex group of dinosaurs had longer arms, according to scientists, suggesting there may have been a reason that they became reduced in both size and joint mobility.

The T. rex is famous for its almost laughably small arms, but it isn’t the only one. Small arms, as compared to the rest of the body, are a relatively common feature among large theropods and ...

The precise purpose of T. rex’s relatively tiny arms has long been mysterious. Over the years, scientists have suggested that they might have been used to grasp struggling prey, to help resting ...

If the world's most notorious carnivore had survived the mass extinction that killed the dinosaurs 66 million years ago, it might have eventually lost its arms altogether.

Ancestors of T. rex and other tyrannosaurids had larger arms, so there’s a clear evolution in the fossil record showing that some selective pressure pushed tyrannosaurid forelimbs to shrink.

His colleague, Henry Fairfield Osborn, who described and named T. rex, hypothesized that the short arms might have been "pectoral claspers"—limbs that hold the female in place during copulation.

T-Rex has two claws on the arms that Stanley says would have helped the creature exert up to 50% more pressure in clawing and slashing. The normal number of claws on for theropods was three.

Sleeping with “T-rex arms” is a common habit that has resonated in parts of the neurodivergent community online. Some TikTok users say that bending their wrists and tucking them close to their bodies ...

T. rex's short arms may have lowered risk of bites during feeding frenzies The unusually short arms of the world's fiercest predator may have shrunk to get out of the way Peer-Reviewed Publication ...