A newfound dinosaur had tiny arms before T. rex made them cool
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A predecessor to Tyrannosaurus rex, Meraxes gigas had a giant head and puny but muscular arms, suggesting the limbs served some purpose.
Can you name some long-snouted, big bi-pedal carnivorous dinosaurs that aren't Tyrannosaurus rex or Allosaurus? - Quora

Louis L. Jacobs – Research

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T. rex's silly-looking arms were built for slashing

A newfound dinosaur evolved a giant head and tiny arms independently of T. rex, suggesting the scrawny forelimbs had a purpose. Meraxes gigas went extinct 20 million years before T. rex walked

This big dino had tiny arms before T. rex made them cool

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