NEW YORK (Associated Press) Not all two-legged dinosaurs were like the lumbering Tyrannosaurus rex. An analysis of dinosaur tracks from 120 million years .
A new analysis of fossil footprints suggests that the 2-meter-tall, 4- to 5-meter-long carnivores that left them could run nearly 45 kilometers per hour, bolstering the evidence that at least some dinosaurs were speedy, agile hunters.