A study of 82 theropod dinosaur species found that meat-eating dinosaurs like T. rex evolved tiny arms due to the development of large, powerful skulls and jaws used to attack giant prey, rather than as a byproduct of increasing body size. Researchers concluded that as dinosaurs shifted from using claws to hunting with their heads and jaws, their forelimbs became redundant and reduced over evolutionary time.
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A study of 82 theropod dinosaur species found that meat-eating dinosaurs like T. rex evolved tiny arms due to the development of large, powerful skulls and jaws used to attack giant prey, rather than as a byproduct of increasing body size. Researchers concluded that as dinosaurs shifted from using claws to hunting with their heads and jaws, their forelimbs became redundant and reduced over evolutionary time.