New research shows that T rex had accelerated growth during in teenage years eventually becoming heavier than previously thought. “Sue” the most famous Tyrannosaurus rex specimen would have weighed in at 9.1 tonnes. This is almost a third more than previously thought. T rex would have had a large appetite to feed this growth, and would have needed a large area in which to hunt. Its top speed was probably about 25 miles an hour.
The results were achieved by using three-dimensional laser scans and computer modelling. Five specimens of Tyrannosaurus rex were studied including “Sue”. The most likely source of food for Trex were Hadrosaurs or duck-billed dinosaurs. They were plentiful and lived at the same time and in the same vicinity as T rex.