Overview
- The peer‑reviewed study, which appeared on Wednesday, May 20, 2026, analyzed 82 theropod species and introduced a new metric to quantify skull robustness.
- Researchers identified five independent instances of forelimb shortening, reporting that Tyrannosaurus rex scored highest on the skull‑robustness measure.
- The team found that forelimb reduction correlated more strongly with skull robustness than with overall skull size or body mass.
- Authors propose that shifts toward head‑and‑jaw attack strategies for very large prey reduced the functional need for long forelimbs while saving energy and aiding balance, but they stress the results show correlation not proven causation and that different developmental pathways produced similar limb losses.
- The paper gives paleontologists a quantitative tool to test long‑running hypotheses about T. rex behavior and could change how museums and scientists explain predator hunting strategies to the public.