Scientists Finally Think They Know Why T. rex Had Tiny Arms

A new study of 82 theropod species suggests tiny arms evolved multiple times in giant predators.

Researchers found that reduced forelimbs often came with stronger, more compact skulls and jaws.

The pattern points to a shift from grasping prey with arms to attacking with powerful bites.

The finding offers a new explanation for T. rex’s famous tiny arms and dinosaur predator evolution.