Meet a close cousin of the T-Rex : the GORGOSAURUS !br Join us on Facebook WALKING WITH DINOSAURS Film Clip # 2 "Gorgosaurus Attacks"br br Gorgosaurus Facts : br Up to 4m (13ft) (shorter than Tyrannosaurus) br Half the weight of Tyrannosaurus br Gorgosaurus was about half the weight of Tyrannosaurus. Being light on its feet, it would probably have beaten T. Rex's estimated 40kph (25mph) sprint by a few kilometres per hour.