Overview
- The peer‑reviewed paper published May 26 analyzed anatomical data from 82 theropod species and introduced a skull‑resistance metric that combines bone thickness, cranial shape and bite‑force estimates to compare taxa.
- Tyrannosaurus rex scored highest on the new metric, reinforcing the view that its head and bite, rather than long forelimbs, were the primary attack tools.
- The team found independent forelimb reduction in at least five carnivorous lineages — tyrannosaurids, abelisaurids, ceratosaurids, megalosaurids and carcharodontosaurids — indicating repeated convergent evolution.
- Authors and outside paleontologists emphasize the study shows strong correlations between skull robustness, estimated bite force and shorter arms but does not prove skull changes directly caused limb loss because of fossil sampling and phylogenetic uncertainty.
- The findings shift the debate toward testing cranial mechanics and bite reconstruction in fossils and may change how researchers investigate other functions for reduced arms, such as display, balance or mating behavior.