Here’s how Tyrannosaurus ended up with a big head and small arms
Tyrannosaurus rex possessed a preposterously massive skull – 5 feet long (1.5 meters) and built to enable bone-crunching bite force – but presented preposterously puny arms. And many other meat-eating dinosaurs shared this mismatched combination of traits. So how did this come to be? Researchers studying this phenomenon have now documented how skull robustness in meat-eating dinosaurs started to evolve first, as plant-eating dinosaurs that they hunted became bigger soon aft
New research suggests that the famously small arms of Tyrannosaurus rex and other predatory dinosaurs evolved as their skulls became more robust for hunting. As plant-eating dinosaurs grew larger, theropods likely shifted their hunting strategy, relying more on powerful bites from their massive heads rather than their forelimbs. This evolutionary trade-off occurred independently in at least five different predatory dinosaur lineages.
Understanding this evolutionary adaptation helps explain the distinct physical characteristics of major predatory dinosaurs and their ecological roles.
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