Overview
- This week a team from University College London and the University of Cambridge published a comparative study in Proceedings of the Royal Society B that analysed morphological data from 82 carnivorous theropod species.
- The researchers introduced a quantitative skull-robustness metric and found a clear pattern: species with more robust skulls and stronger bite-related features tended to have more reduced forelimbs.
- By that metric Tyrannosaurus rex scored highest for skull robustness, followed by Tyrannotitan, supporting the idea that jaw-focused predation drove arm reduction in some giant predators.
- The authors argue that hunting very large sauropod prey made grappling with claws impractical, so selection favoured bite-and-hold strategies that made forelimbs progressively redundant.
- The study emphasises clade-specific developmental routes to limb loss and notable exceptions such as long-armed spinosaurids, and it presents a testable morphometric hypothesis rather than definitive behavioral proof.