Why were T. rex’s arms so tiny?
The study of theropod dinosaurs, including T. rex, reveals that many species evolved to have smaller forelimbs as they relied more on their powerful jaws for hunting. Researchers found a strong correlation between skull strength and the reduction of arm size, suggesting that larger prey led to this evolutionary change. The findings indicate that as theropods developed stronger heads, their arms became less important for capturing prey.
- ▪At least five groups of theropod dinosaurs experienced a shortening of their upper arms over time.
- ▪Researchers found a strong relationship between short arms and large, powerfully built heads.
- ▪The study suggests that theropods increasingly relied on their jaws for hunting larger prey.
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At least five groups of theropods all gradually relied more on their jaws than front claws. Credit: Orla via Shutterstock Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent six days a week. Email address Sign up Thank you! Terms of Service and Privacy Policy. Tyrannosaurus rex is iconic for its ferocity and big teeth, as well as those teeny-tiny arms. The Cretaceous Period apex predator wasn’t the only carnivore with underdeveloped forelimbs, however. At least five groups of two-legged, mostly meat-eating theropod dinosaurs experienced a shortening of the upper arms over the course of their evolutionary journey. But why did they have such comically small claws? One team of researchers believes the answer is simple.
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