Overview
- The paper published in Proceedings of the Royal Society B in May 2026 analyzed anatomical data from 82 theropod species to test links between skull structure and forelimb size.
- Researchers developed a skull 'resistance' metric using bone thickness, head shape and estimated bite force to quantify how well heads could absorb and deliver bite stresses.
- The study found a strong, repeatable correlation between more robust skulls and reduced forelimbs, with Tyrannosaurus rex scoring highest for skull resistance in the sample.
- The pattern evolved independently at least five times across separate carnivorous lineages, which the authors and commentators interpret as convergent evolution tied to a head‑centered hunting strategy.
- Authors caution the results show correlation not direct proof of causation but say the findings reframe short forelimbs as an adaptive trade‑off with implications for how paleontologists reconstruct predator behavior.