
Tiny Arms, Big Mystery: Why T. rex Arms Were Proportionally Short
T. rex arms were about 1 meter long, roughly 30% of the leg length, prompting several hypotheses about their function—from display and prey handling to balance as skulls grew larger—with no consensus. Some scientists view the arms as vestigial or a byproduct of skull enlargement; others suggest a defensive or ecological role in crowded feeding scenarios. Ongoing fossil research may yet reveal why this tiny-arm trend occurred repeatedly in theropods.



