Scientists may have finally cracked the mystery of why T. rex had such tiny arms
A recent study has provided insights into why Tyrannosaurus rex had disproportionately small arms. Researchers found that as T. rex evolved larger skulls for hunting, its arms became less useful for predation. This evolutionary trend was observed across multiple predatory dinosaur families, suggesting a common adaptation to larger prey.
- ▪A Royal Society research paper suggests T. rex evolved smaller arms as its skull grew larger.
- ▪The study analyzed 85 dinosaur species and found a correlation between larger skulls and shorter forelimbs.
- ▪Researchers concluded that as prey grew bigger, T. rex relied more on its powerful jaws than its arms for hunting.
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Science Scientists may have finally cracked the mystery of why T. rex had such tiny arms By Richard Pollina Published May 27, 2026, 5:23 a.m. ET See more of our coverage in your search results. Add The New York Post on Google A new study claims to have solved the long-standing mystery of why Tyrannosaurus rex had such disproportionately small arms. A Royal Society research paper published May 20 suggests that T. rex, which averaged more than 40 feet long with arms stretching just 3 feet, naturally evolved smaller arms as its skull grew larger. Researchers analyzed 85 dinosaur species and found a consistent correlation among five groups — Tyrannosaurus, ceratosaurids, megalosaurids, abelisaurids and carcharodontosaurids — each showing a pattern of larger skulls and shorter forelimbs.
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