T. Rex’s Tiny Arms May Have Evolved for a Surprisingly Brutal Reason
Researchers found that skull durability was linked to smaller forelimbs across 85 theropod species, with the pattern evolving independently in five lineages.
- Researchers from University College London and Cambridge University published a study linking arm reduction in theropods like Tyrannosaurus rex to the evolution of massive, powerful skulls used for hunting large prey.
- "It's a case of 'use it or lose it'," said lead author Charlie Roger Scherer, a PhD student at UCL Earth Sciences, explaining that attacking 100ft sauropods with claws became impractical compared to using robust jaws.
- Analyzing 82 theropod species, researchers found five distinct lineages—including tyrannosaurids and abelisaurids—independently developed smaller forelimbs, a trait more strongly linked to jaw strength than overall body size.
- Giant prey likely triggered an "evolutionary arms race," forcing predators to evolve stronger bites to subdue targets, according to research in the Proceedings of the Royal Society B Biological Sciences.
- While separate lineages reached this outcome through different evolutionary pathways, researchers hope future studies will clarify how this functional shift influenced other developments, such as the emergence of feathers and flight.
27 Articles
27 Articles
The evolution of stronger jaws to hunt giant prey caused the front extremities of the tyrants to lose their use.
The evolution of tiny anterior limbs in carnivorous dinosaurs, such as the famous Tyrannosaurus rex, probably responded to the development of extremely powerful heads. A new study led by researchers from University College London (UCL) and the University of Cambridge analyzed data from 82 species of theropods to understand this physical characteristic. The scientific team found that small arms maintain a close relationship with the growth of rob…
For a long time, researchers puzzled why the terrifying T. rex had such tiny forelegs. Now, an analysis provides evidence that perhaps the massive jaws made the limbs superfluous. And T. rex was not an isolated case.
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