No Olympian: Analysis hints T. rex ran slowly, if at all

Tyrannosaurus rex, a bipedal meat eater considered by many to be the most fearsome dinosaur of its day, may not have been the swift Jeep-chaser portrayed in Jurassic Park. Scientists figure that for a 6,000-kilogram adult T. rex to dash along in high gear, as much as 86 percent of its body mass would need to be leg muscles–an unlikely pair of drumsticks, indeed.