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It is my theory that the T Rex and his peers developed small arms due to smaller arms facilitating higher speeds when in locomotion, thus natural selection breeding a small limbed machine the retained clawed upper limbs for grasping prey.
On the big screen, the Tyrannosaurus rex is often depicted as a predator that could easily catch up to a speeding car with a few swift stomps. That's probably because paleontologists had suggested that the T. rex clocked a top speed of 30 miles per hour and a walking speed between 4.5 and 6.7 miles per hour, reports Jeff Spry for SYFY Wire.Now, researchers from the Netherlands have used computer reconstructions of a T. rex tail to estimate that the walking speed of the carnivore was much slower. According to the new study published in Royal Society Open Science, the predators walked at just under 3 miles per hour, reports Katie Hunt for CNN...Studying how dinosaurs moved can help paleontologists further understand dinosaur behavior and how they thrived in their prehistoric ecosystems, CNN reports. In future studies, the researchers plan to use this method to calculate the top speed of a T. rex when it's sprinting. Other researchers have surmised that the heavy body of a T. rex, weighing between 11,000 to 15,000 pounds, hindered its running speed. However, van Bijlert suspects that the dinosaur's tail may have absorbed the shock in a way that made it able to run faster without breaking any bones, Live Science reports.