Tyrannosaurus rex had tiny arms because it had a big head

The Tyrannosaurus rex, king of the dinosaurs, possessed a skull so large it could rival the size of a refrigerator, measuring up to 1.5 meters in length. This formidable head was not for contemplation but for killing, with powerful jaws capable of tearing apart prey larger than itself.

However, the T. rex is equally known for its comically small forelimbs, each bearing only two fingers. If scaled to human proportions, these arms would resemble little more than protruding meat forks. New research from British scientists, published in the Royal Society's journal, proposes a direct link between the dinosaur's massive head and its diminutive arms.

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If we humans had arms as short as our body size, it would be like two meat forks sticking out of our armpits.

Researchers mathematically compared the skull structure and forelimb size of various dinosaurs. They discovered a clear correlation: predators with more robust skulls tended to have weaker forelimbs. This suggests an evolutionary trade-off, where limited energy resources directed development towards strengthening the skull at the expense of limb size. Paleontologist Charlie Scherer, a lead author of the study, explains that attacking prey with powerful jaws was more effective than using claws for tearing, likening the T. rex's hunting strategy to that of a "running shark."

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It is not practical to try to tear and rip a 30-meter prey animal with claws. Attacking and grabbing with strong jaws is more effective.