The fearsome Tyrannosaurus rex (T. Rex) enjoyed a 'leisurely' stroll at just 2.8 miles per hour (4.6km per hour), a new study reveals. Scientists in the Netherlands developed a new method to estimate the preferred walking speed of T. Rex, based on analysis of a preserved specimen called Trix. They say their new speed estimate is a rate similar to the natural walking speed of emus, elephants, horses and humans ...